(Just like apts.)If you have any park owned homes you will have to value them individually.

If so, is it through each individual city or a county? 

Get a strong operating agreement drafted that outlines the purpose of the business and your individual roles in detail.Take it one at a time and grow from there!

Learn a few local/state down payment assistance programs.

You could find a potential partner who could assist you in getting into the game even fasterGood luck!

or the individual's income? 

Account Closed so the Downpayment Assistant Programs (DAP) are only for homes you live in. 

@Ashraf Abbas please inbox @Aaron Stuiber he is a real estate salesperson with my brokerage and might be able to provide some assistance.

Damage in individual bedrooms is easy enough, but you won't know who left that huge hole in the wall in the living room.

But I guess this is subjective to the individual wholesaler themselves, shady ones don't care much about the seller, or know about the market, good ones want them to get the most they can get and know what that is.