If anybody can help me get an outline of start to finish articles to read, videos to watch, step by step, I would greatly appreciate, this site is full of great people and I hope one of you can help me out.

A good lease outlines how a landlord can enter a property.

look up your tenant/landlord laws and follow the process outlined there. 

Ask if there are any any additional fees for maintenance, advertising, evictions, etc... and make sure they are outlined in the agreement.

This is obviously insane, however after a lengthy email outlining my complaints they have agreed to waive the closing costs if we proceed.  

Google "MGIC rate card" this will outline what your PMI should be provided you know the coverage requirements and your FICO score. 

I would have done cash out refi's on everything before closing on #5 if I knew better and now I have tons of equity I can't touch)Even though you can't do a LLC on title, still write up something legal with your partner to cover both of you and outline everything.  

But if he does , he can: 1) Simply draft up a Letter Of Intent, with bullet points outlining terms of a proposed offer, subject to a week or two "due diligence" on his part, and include that "this is not binding on the parties" 2) Fill out a standard contract with the same due diligence period.  

Personally, I would stick with the GLVAR Residential Purchase Agreement and use the additional info section to outline the as-is terms. 

Since texting isn't likely a required method of communication outlined in the lease, I'd just block his texts at this point.Its definitely time for an attorney, and I'd recommend using someone who is a heavy-hitter as a landlord advocate so that any silly half-baked attorney this guy hires will get the idea that you mean business and know what they are up against.