That said, that isn't the kind of action I'm personally cool taking part in or giving advice to others to do. 

Scott's book The Book on Estimating Rehab Costs, it's quite good: https://store.biggerpockets.com/products/the-book-on-estimat...3) Always build in a contingency to your rehab estimate, I usually go with 20% over what I expect it to cost4) Make sure to account for holding costs too of courseI hope that helps

BUt why cant i get a lien when the person clearly agreed to pay back in a contract and he failed to pay? 

I assist clients in figuring out methods to finance real estate, and house hacking is my bread and butter.Something i've done personally and continue to help new inspiring investors do every day.

BP is a great place to start however I feel in person gets you further.

Guiding, advising, meeting in person, hours on the phone, discounting on property price and services.Properties appraised for more than you paid, you sold for more than you paid.

Personally, I have a boutique investment company.

House hacking will also give you some personal "property management" experience.

I'm further assuming that both your personal home, and the property, are both in Lancaster County. 

Hey Anthony, I am a Real Estate Agent and investor based in Columbus and personally grew up in Cleveland .