which  site do u use to find providers?
and for providers which site is best to advertise on for los angeles providers?

Here and CityVibe are the main places that get looked at. Personally, I dock major points for advertising on BP/CL.

It's also worth your time to check what comes up when you google your contact number, name, or email.  
Generally you'll do well here on TER if you have good reviews.

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carry too high of a risk for scams and B&S for me.  

Looking at your profile, you have most of the sites I prefer to browse.  I will say the biggest single factor for me as of late is P411.  If you have a profile there, we are golden.  

I do have p411 and it's very safe ... for both parties ... that's what I like about it ... thanks u guys for the feedback