Let the suggestions begin
Forget vivastreet etc. until you're more experienced - you've got no comeback if it goes wrong. Stick to Adultwork for now. I'm curious about Indian girls too and have noticed even there, there're a lot of weird looking Indian profiles in Birmingham that seem to have been written by pimps. There's an enticing Desi profile in London but I googled Desi and it sounds like they start training those girls young, in India anyway, which is something I don't wish to support. I'd steer clear of Indians unless you can find good well reviewed indy you like the look of who'll see blokes your age.
Also I don't know what specific services you're after, or how much experience of sex you have. So if you're a noob at it (as I suspect by wanting to pay for it so young) I'd get your sexual misadventures out of the way first before you're paying for the time. Get used to condoms, buy some you like, read up on sex guides online about giving oral.
Make sure you're clued up and have a punting phone / SIM - don't lose your job due to looking at punting websites or phoning prostitutes using your employer's property.
With all those provisos I can highly recommend Hannah in Birmingham https://www.adultwork.com/2516441
and there are loads and loads of great girls in Manchester.