Chantel, go on adultwork if you want a free listing - at the very minimum you can pay 1 credit (?1 or so) a day to display your phone number.
Don't take this the wrong way, but by saying things like "if they were too undesirable" and expressing a desire to see a photo of the client, you're opening yourself up massively to all the timewasters and trolls (and AW has them in abundance! They do lurk and wait for new girls then bombard you with a load of emails). I don't think a paper ad is really a good way to go if you're new - it can be very mundane, very repetitive and its been my only real experiences of look and go (some twat wanted me to "do a twirl" - why don't YOU twirl on my 8" strap on, asshole). Saying that though a lot of my bookings from the paper were actually alright blokes, even if they were more of the Ian Beale type variety looks wise.
A lot of men just want company true, but company that convincingly likes having his willy in their mouth. You don't have to see all ages or ethnic backgrounds either - ultimately it is your body and therefore your choice as to who you see. I personally would feel nauseated seeing someone older than my dad (who is 55) - I look far younger than 28 as well and to me I find the idea of a guy who is more than twice my age wanting to have sex with me kind of... disturbing. Saying that though, some men age well, some men take care of themselves as they hit 40+. But how will you handle a guy who has erectile dysfunction because he's getting on a bit, even if he looks alright? How will you handle having to have sex with someone who is seriously, clinically obese (beyond cowgirl, fnarrrrr)? You do have the right to refuse service but your average client is not going to be a good looking guy. The older women here will probably contradict me, but in my experience men in their twenties largely do not pay for sex with women in their twenties. They most likely have MILF/Mrs Robinson type desires and go for that market. Not to sound horrible, but at 18 you're more likely to get older men. MUCH older men.
When I first started in the industry I was seriously misled as to the type of client I would get and was quite stringent in many ways as to what I would do, when I worked and who I saw. With regards to the 'older men' comment, nowadays if you offered me the choice between a 27 year old client or a 47 year old client, I'd hands down pick the latter. But I know that he's more likely to be a) married, so understands the female psyche a bit better and thus treats you with more respect, b) more sexually experienced, which means the sex isn't actually that bad c) professional, which means he understands its a business transaction and doesn't take the piss as much. But when I first started I would have went "fucking a 47 year old? Ew!" If I could exclusively see men in their 40s I would. I have a low bullshit tolerance and in my general experience, they get that more.
If you have something that makes you stand out, it helps to emphasise it. I ain't no supermodel lol I'm a 12-14 and covered in tattoos, hugely sarcastic and an out and out tomboy but I always did okay for me and mine. I always attracted the businessman type because of the way I come across in my profile, but I do get a lot of music and art industry types because of my inkings too. Trust me, its not glamourous and they don't look stunning nor are hung like stud horses!!! Ditto being in 4 & 5* hotels - the first time I had full whore sex was on one of the highest floors in a Hilton and I was so self conscious turning up in my Dorothy Perkins suit. At the time I felt like such a baller fucking in a suite in the Hilton but now I find myself thinking the decor is awful and the entire chain is overpriced. Ditto fucking someone who does A&R for X label or owns his own distributiony type music stuff. You'll get moments where you think omg! Did I really just fuck X who does Y who knows Z?! before you think "the envelope. GIVE ME THE ENVELOPE. I don't give a toss who you know or who you signed or about the mini-bar wine or that if I look out of this hotel room window I'll get vertigo." Some of my 'friends' thought I led this uber-glam lifestyle and I was the one buying all the drinks on a night out, apparently I had a swanky pad and I was just, you know, super rich and had nothing to ever gripe about, and all my clients were mates with Kings of Leon or whatever they told themselves. You'll hear a lot of glam stories, but I've slept with way more podgy electricians and computer programmers in my bedroom than I have been called to the Malmaisson to be raggydolled around by someone toned and tanned in their uniform.
I second the thoughts of the women who said 18 is too young. I couldn't have done this job at 18, I wasn't cynical enough of life and the human race. You don't have to be a pessimist to do this job - far from it - but you do need that slight life experience that makes you able to read situations far better. Circumstances in my childhood saw me living independently at 18, having had to grow up fast, so its not a slur that you or anyone else in this age group is 18. Far from it. Its that you are going to run into chancers, twats, timewasters and sometimes unscrupulous assholes who see - I'm sorry to use this terminology - 18 year old flesh and have the kind of thoughts you'd rather not see at any age. The sex industry is full of people (males and females) looking to shave a percentage of your earnings because they think its big bucks and sometimes you need the life experience to be able to gauge situations that drop at your feet. You may be different - there are plenty of successful escorts between 18-21. But how will you handle day to day life, leading a very secret, socially frowned upon, profession? Do you have friends you really can 110% trust, that you can confide in - or are you going to have a lot of hangers on? I pretty much fell into this at 25, unable to get a job anywhere else and had rent to pay. I was the last person you'd expect to escort and if I'm honest I found the whole idea did not sit well with my own morals and beliefs. You however might be like me and see beyond your own preconceptions of the industry and see what it offers you financially, and end up liking your job. I retired then came back part time, put it that way - and I hated the thought of it back in the day. YMMV.