I guess what I can tell you is that you won't find what you're looking for in a forum post alone.
There are a lot of places that covered SEM inside and out, in PPC academy style posts, that span the length of 3-4 pages of article links.
I think that you're not patient to read through them, you won't be patient enough to see through PPC campaign optimization.
On the off chance I'm wrong (could be, just guessing here), you'd be best served reading through something like SearchEngineLand's "PPC academy" and taking it from there