Selling with owner financing

[Shaun R.]

I bought a condo that I was originally going to rent, but since I'm usually pretty strapped for time, I'm considering selling via bond for deed.  I have been reading on line and I get how it works... seller retains title until the property is paid for, then title changes hands.  I'm curious about the part where you're acting as the banker.  I'm going to set the term and interest rate, and I can print an amortization schedule out in the beginning.  But how does it work if the buyer starts making extra principal payments?  How does that affect the amortization schedule?  Is it better/easier/less confusing to just not charge interest?  

I tried putting in a call to an escrow services company today to get some info and see how much it would be for them to handle it, but they never called back.  I want to know if it's going to be too complicated for me to handle on my own.