I'm invested with individuals who have each put much more cash into the deal than I have, and their only compensations is a fixed percent of total profit. 

I use my own application, which has an imbedded authorization to release information for their employer and landlord.If they have not confirmed an hour prior to their appointment, I send this text to their phone (which was required as part of their contact information I required in the response to my ad):As I had requested in my email, you have not yet confirmed your apartment showing for this evening, scheduled for 7:00pm.

What i would recommend is joining a REA or other real estate meet-up group where you can connect with other likeminded individuals consistently and share knowledge.

Furthermore, the individuals entering into these agreements believe the transaction to be a loan.

If you are receiving 3-5 per week that’s not bad, considering the price is what most individuals look for when looking to rent.

I'm reading a book now where the author purchased hundreds per year putting minimal amounts down, that doesn't work anymore.

I personally avoid individual showings and schedule open houses instead.

I have sent trades to home depot, pick materials, and HD calls me for a CC number and authorization.

How much time / cash / other are each individual expected to contribute?

I have used LLCs individually for the properties that I've owned and I'm glad I did.