I would much prefer to keep it as the method you are currently doing. 

I'll pay closing (no realtors involved, I'll get an attorney).

Does anyone have any methods or ideas as to how to find Roommates / Tenants for this sort of thing?

It involves real estate and you do have to invest money. 

The timing has to be right for BOTH you and the market you are looking to be involved in and the numbers on a specific deal have to ultimately make financial sense.  

I'm going to try the BRRRR method and keep going until I cant.

The situation you have described above does not involve either securities or people with no prior relationship.

I wouldn't get involved.

You'll find them a variety of ways: expired listings, landlords who have filed for eviction, probate sellers, pre-foreclosures, and as referrals from active agents, just to name a few methods.

if your a beginner highly unlikely your going to get Zero money down deals.. there will be some closing cost some cost involved.. you should work on some kish up front then go shopping.. nothing spells failure quicker than under funded.