This thread should be of help:
While it mainly focuses on the official process, alternatives and thoughts are provided by experienced testers and authors. I’d give it a careful read (ignore the heated feelings - there was controversy or drama about a particular game at the time).
Here is an older thread that should add value to your understanding as well.
I have a lot of testing experience, so if there are specific questions, concerns or you just want my view on a thought - just let me know.
I personally have not read your WiP yet; I was under the impression you were not very far along in it yet and I did not want to read it until you got further along.