Not white knighting, but in this lady's defence she seems very inexperienced and probably really doesn't know the ropes just yet.
Being quite young she's going to have certain ideas about how things work and has no idea how realistic or otherwise they are. She's still living at home with her parents for goodness sake, so she is definitely still feeling her way around this thing.
So observations/advice to the girl...
As others have said, it might be an idea to contact SAAFE or speak to an experienced, well regarded (by punters and peers) working girl to see if she'd offer to mentor you some, because I can see from this that you're saying and doing stuff for the right reasons, but you are putting big restrictions on the number of clients you can see...
Black guys, north west London and guys with cocks bigger than 6 inches. Not to mention being outcall only. If You can remove some of these by speaking to a lady who is happy to show you the ropes, I think you'll be quite successful because you are super cute and there's a lack of good young Indian girls around.
You also need a bit of luck with your first few clients to make your entry into this game as smooth and stress free as possible.
I've fucked loads of young girls who are new to the industry, are nervous or unsure, and I'm extraordinarily careful and considerate with them whilst helping push their limits as much as they want to.
For example I once saw the tiniest little 18 year old who had been in the industry for a couple of weeks. In the second of our meetings in a week I had taken her anal cherry - something she really wanted to try, but was understandably anxious about. I treated her with patience and consideration and we did it without any pain or discomfort.
So I'd personally love to see you, and think we'd click. The problem? I'm just under 8 inches in size, so that rules me out. Regardless of the fact I'm pretty sure I could have sex with you without any discomfort because I'm experienced, patient and considerate.
Ho hum!