Are they giving you a mortgage? If so for how long? Either way-anyone with a financial calculator can compute what the monthly payments will be. You justpay them that amount each month over the life of the loan until paid off. Hopefullyit's not an interest only loan...IE:100k loan10% rate10yr term__________________________$1,321.51 monthly for 120 months
While private loans don'e usually require a servicing company its a good idea to document the repayment schedule and obtain seperate receipts or cancelled checks for each payment. This way everyone is on the same page as to when and how the loan gets paid off.
You don't necessarily need a company to handle it, but check out CircleLending.com to see what they offer. They are a third party private financing service type company.
You might want to pay a good r.e. attorney 300/400 bucks to draw up loan docs for u.
www.circlelending.com