In this case, the sellers where more motivated by making things simple and fast than any other factor.

Work with a list broker to come up with a good motivated list.

Structuring it this way minimizes the risk for both partners and motivates me to get it done as quickly and inexpensively as possible.

I started in building multi-unit in the 90's and the tricks and tips from back then that helped give better efficiency and cost's are now absolute must do's to not loose ones shirt, that's the first key aspect of a good building partner, a master of logistics, MASTER.

This is a way to award/motivate the sponsor for solid performance. 

to open up the conversation, take all opportunity to build some rapport, and what you REALLY NEED TO KNOW here is there any motivation, distress, or need to sell this house (or any other- don't forget to ask!!)

Was your motivation to do seller financing to limit your out of pocketcost (ie down payment)?

The realtor I'm working with says there most likely squatters in the house (junker cars in the yard, black plastic on the window on the bedroom side, one window is open = lack of power/lack of a/c).I'm still willing to buy to fix up and flip, for the right price, assuming I can either be assured of the property is vacant, or there is a low-cost, efficient eviction process in Columbus, GA.I appreciate any advice from people with experience on evicting squatters in GA.

Find the folks that are motivated to bail out.

Once you have built this rapport, ask them why they are selling, and figure out what their motivation is.