Best of luck on your ventures.

I think like anything, it heavily depends on the invidious inspector.The home inspector I Use, owns property himself, spent 5 years running a renovation company and is the ultimate DIY person.

Keep in mind a platform that was built for smaller DIY landlords (1-15 units), whereas some of the larger platforms might not be as cost-efficient, whereas a small one built with DIY landlords in mind offers state-specific leases (based on the property address; uses that property address to import all necessary local clauses into that residential lease and allows you to add custom clauses and renter rules to it as well).

He didn't say he was going to stop investing with me, but did say that his next venture was starting to look at his financials.

As a DIY landlord who does his own lighting fixture replacements, once again I find myself speaking about what I know and not from a wider perspective.

It would be in either a Joint Venture Agreement or Operating agreement for your LLC. 

The rent collection aspect is just one part; might want to keep in mind a platform that was built for smaller DIY landlords (1-15 units) that offers all of the necessary tools; ie. listing to 10+ major listing sites, comprehensive tenant screening, state-specific digital leases (based on the property address; uses that property address to import all necessary local clauses into that residential lease and allows you to add custom clauses and renter rules to it as well) AND online rent collection. 

Or maybe you find a local investor who will joint venture with you where they provide the rehab money, perform the rehab money, and then get a fair equity split when the house sells (after their rehab money is returned)?

I took a look at your website; great to know your services exists for my future out of state investment ventures. 

Once you do decide to procure your first rental, definitely lean on the BiggerPockets community as a resource; I'll also say that it could be worth considering a shot at a software solution built for DIY landlords (1 - 15 units) to bring some automation to the rental management process (just to make things much much easier for you)!