There are provider only boards, BUT, until you're a little more established you will probably have a hard time accessing them.  For example, TER has a PO Board, but you have to have at least 3 credible reviews to join, and they like you to have some board activity as well before they will let you in.  This is not an uncommon requirement for the PO boards, mostly because we may discuss some sensitive topics, and we want to do what we can to prevent leaks.  The system is not perfect (there are leaks), but the best way to protect ourselves is to try to make sure that only established, legit girls are there.

It's like a young person trying to get a job - they can't get a good job without experience, and they can't get experience without a job.  

But keep at it, be tenacious, and you will get there.  If you are able to establish a relationship with an experienced, established provider you will probably learn a lot too - but be careful who you trust.  I really can't say that emphatically enough.  

As to your review and what will make the hobbyists more comfortable, well....I'll leave that to the hobbyists to answer.

I think I found your website in LA but when I try to access your TER profile I get "Provider information is no longer available on TER. "  If your other clients are finding the same thing, that might be why they are being scared away.

as TER software Red Flags that as a self review & could trigger a permanant delisting/ban.  If someone used the same IP somehow, perhaps you can plead your case to admin. This strict but is why TER reviews are worth anything.  
Yes, it could be helpful to have a mentor... in your own area would be nice but an established provider would probably reluctant as you are competition.   Through TER perhaps you could find a mentor outside your area who would be willing to take you under her wing as it were.
skb