It's about twice the size, three bedrooms 2 bath, and they are asking 309 (dropped from 320).

I'd look for something that is the size you want but needs work, you can live in it and rehab as you go.

Set house rules, no smoking inside, kitchen cabinet space designated per room.I have a house 6 guys living there by the room. works out, they have a chore chart sheet like who takes trash down, who cleans bathroom week 1, weekly clean up of main areas on Sunday week 1 and they switch off weeks.. yup faces change but not to much of grief factor. they seem to realize that they all are saving some bucks with this arrangement.  

Then they are going to try and find the comps as close to you as possible ( no more than a mile away) and as recently as possible ( no more than 12 months old) in as close condition, size, year of original build.When in doubt, think conservative, when your looking at the comps always error on the side of caution and go with the lowest numbers not the highest.

Once I have a list of properties, how do I find out how much equity the homeowner has in the home (or what is the size of the loan left on the home)?

Beyond that, most companies make money off the loan based on risk premium, rate and yield spreads based on loan size.

Your examples have one thing in common: size. 5000 investors is way too much.

That likely costs the same for a small park as it does for a larger one.The biggest challenge you face is the size, it is small.  

You cannot use a one size fits all strategy here.  

Reserve cabinet in kitchen for each room and set a schedule for clean up.. rotate chore chart, like week 1 ,,room one does bathrooms, room 2 does all vacuuming, room 3 all trash out to curb, room 4 mowing and rotate..