I am wanting to know what the best method would be for record keeping of the split cost (For Tax purposes mostly) I have a couple of ideas below of what I think could work but am looking for insight.1.

It's nice for them, but not always the most efficient or effective method for the Landlord. 

The easiest sell to me if you can't bring money is find a value add property and explain the BRRR method to people who have money (basically if the deal is done right their money will be tied up for 6-9 months and then they get it back at refinance), you find the deal and manage the rehab of the property.

As well, being a single resident of my home, I am also going to try the house hacking method and rent out one or both of my extra rooms, depending on what ends up working out.  

I can't qualify unfortunately (self-employed with less than 2 years of tax returns).

My current employer here in New York is schooling me all about the business owning/running side of contractors, plus listening to contractor and business related podcasts and audiobooks.

If you're looking to leverage the value of your home the best method I know is a HELOC (Home Equity Line of Credit).

There are several tax methods available that can increase your cash-flow on properties you invest in.

• Is there some other heretofore unseen strategy I should be employing?

so we are die-hard self-employed and needing to let go of the $10 decisions so we can make the '$10k' decisions as bp likes to say...So from my 'in the weeds' view: I need an office mgr, marketing mgr, rehab mgr and deal generator.