Hi lovelyEve, welcome.
Please don't chastise yourself. We've all been there and we've all been as nervous as hell when first starting out. It'll get easier with time, I promise.
To answer your question, when somebody calls and asks you for details, in my experience, it will either mean that he's a timewaster and he gets off on hearing about you and your services, or, more rarely, he'd like to get a few details first so he could save booking you for another time. If you have a website where he got your number from, chances are everything he needs to know is really already answered for him. But then there are the odd gent who would like to find out that little bit more.
Don't be disheartened by the fact that he didn't book you. Not every gentleman that calls will. A lot will call with genuine enquiries, maybe something they haven't been able to find on your website which they'd like answered. Next time somebody asks you for some details, ask, "what would you like to know?" It stops you going into this whole spiel about what you do and don't offer, and if the caller is serious, he'll know exactly what sort of questions he'll want to ask.
And no, don't ask any client when they'd like to meet, leave that up to them. It'll come over as pushy and there's no quicker way to turn a perspective client off. Being an escort itself isn't illegal, so therefore I'd imagine that quoting your prices and services over the phone isn't, although to be quite frank with you I'm not sure about the legalities of quoting sexual services over the phone. But for various reasons there are some ladies who don't feel comfortable reeling off a menu and prices anyway. For some it just feels tacky. For others they feel that there's a fear of entrapment and feel they might be recorded. That may seem farfetched to you but newspapers and journos still seem to live by the old adage that sex sells newspapers, so you never know when there's a tape recorder being switched on.
Next time you get a phone call asking for details, as I say, ask them what exactly would they like to know. Keep your call short, sweet but concise. Try not to get caught up in too many explicit details, that's a sure sign of a timewaster looking for free phone sex. Then if you feel that you've done enough in selling yourself, just end it by saying something like "is there anything else I can help you with?", and bring the conversation to a close. If all else fails just refer them back to your website. If the caller is serious, he'll come back and book you. If not, well at least you won't feel that you've wasted your time for nothing.
You'll never completely weed out the timewasters. But in time you'll find a way to cut the amount of them down. The best of luck to you and feel free to ask any question you like.