I walk up and say, "Hi my name's Bill, I just spent a few hundred dollars to set an LLC and I'd like you to give me a loan secured against some property.

.”, wouldn't he have to pay the attorney the additional $18,000 to actually own the house before selling it, or did he secure a payment plan or loan for the rest, then sold the house and payed off all monies owed?

You need the buyer to understand they will keep the security deed until/unless you completely pay them off. 

You can go to small claims for that, in case you don't have a security deposit to cover it and the damages already

Additionally, for purchases, it's possible to do portfolio, but it is difficult as you're working with 5+ different sellers at one time to secure one loan.

You can secure offers on the property.

Though here and there I still perform for the home owner, my focus has shifted towards Home Flipping.

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

Non performing and Performing?

If this were foundation plumbing or electric I'd obviously (have to) hire a licensed contractor but this work didn't seem too... risky in being able to salvage after some loss to erroneous work or performance.