You have to be 18, but you can typically find someone willing to hire you, pay for your license, and train you.

I sent them a certified letter that basically was the pay or quit form.

If I want the money out for a longer period of time, longer than a year, I prefer to refinance.A HELOC is much like a credit card, in that you pay what for the amount you use, and it can be repaid and then drawn on again. 

Seller pays per dium ( to the day that you close through settlement).

Invest with sponsors who perform proper diligence and underwriting and perform extensive diligence yourself on the opportunity and sponsor. 

I am house hacking paying about 500 to cover mortgage.  

Just be ready for the lender to order a foundation inspection report and appraisal - both you pay out of pocket. 

How much % would you suggest paying him?

When you build from the ground up in todays market you are paying top dollar for materials, builder costs, land lots, rates, etc.Log cabins can be tough because most appraisers will only use other log cabins on an appraisal to support value.

I don't know the detail as far as the tenant paying rent or not, if there's a lease contract etc.What questions should be asked before buying this investment opportunity?