I have heard that it is common practice that private money lenders collect a monthly fee thru various methods, I'm trying to determine what those methods are.   

The BRRRR method?

Quote from @Tyler Garza: Quote from @Kishan Purohit: @Tyler GarzaEstimating ARV accurately is key to making the BRRRR method work.

Once the 1031 is complete the LLC dissolves and again the property is distributed to the former members, including the properties just purchased in the 1031 exchange (which each member probably picked out for themselves).This method solved the feared "held for investment" issue. 

I’m particularly interested in methods that have worked well for you in terms of finding deals that aren’t listed on the MLS.Thanks in advance for your insights and suggestions!

I have a pretty large capital ready to step into this game,I am in big conflicts either choosing Ohio(Cincinnati/Dayton) or Texas(Houston) for BRRRR method, I read a lot about Ohio, only positive stuff.

its just another method of flipping a contract..   

What tools or methods do you use to verify income beyond traditional documents?

They will have systems in place to find off-market deals so you can analyse where the numbers are more attractive for you.You can also try the wholesaler list method.

What alternative method(s) would you recommend for beginners?