Any app give you access will be risky for the other side. On the other hand, without getring access by yourself, I doubt you can solve a lot of problems.
How high should prices be?
It should be fixed by you only. You know how much afford you are giving to and how much your afford worths. Some people charge $10 for 1000 words article while some other charges $100 or in some cases higher too. It depends on people who offer the services.