How to benefit partners?

[Ben Visser]

Background: 

I'm working on buying an owner occupied home through conventional loans. Due to DTI (child support, etc) we move all my husband's debt to my name. He and a friend are the actual names on the loan and I'll be added as tenants in common. I'm funding the whole thing.

I found a duplex in the search, and see potential,  but it is a longer process (lines,  absentee owner,  city issues). 

I'm going to attempt a sub 2, but want to also look at conventional loans as a backup. My DTI is too high (child support will be a chronic hurdle) .

I'm looking at bringing in other friends to be names on the loan. Again,  I'll  be the person funding. One friend  will probably live in one room in one of the homes. 

Suggestions on how to make this beneficial to all? I'll  be the one putting money in,  they will be on the loan in name only basically. 

What has been done? Percentage of rents? Equity? Etc? 

Thanks in advance.