I am 49 and not had any problems getting work so far. Sorry to be blunt but there is not a lot that puts men off and there are all sorts of tastes. Of corse most men prefer the vogue model if they can get that but there is a huge demand for all shapes and sizes. There are men that go for big girls, tiny petite girls, mature, barely legal, black, white, asian, you name it there is someone out there looking for you. Regarding scars I suppose if they are facial scars some men might be put off but otherwise I doubt they will notice.
The main thing is to be yourself and be honest about what your good features are. If you consider yourself fairly average looking then promote yourself as the girl next door. Just consider how to promote the positive features, don't try and be something you are not. For example if you are the quiet type then promote a girlfriend experience, or if you are the wild type that will ride him like a porn star then promote that.
Get yourself a phone just for the job and then you can easily switch it off when you are not working. No harm in sticking with your day job and just doing weekends or something to start with to get a feel for what you want to do.