Seller Financing Deal Analysis

[Shannon Fogarty]

I am a newbie looking into purchasing rental properties utilizing seller financing. I am interested in using a subject to deal, but am obviously open to all strategies. I have yet to make my first deal,  but I'm looking to do as soon as possible. 

When utilizing these strategies what information do I need to analyze the deal? The rental calculator here on BP uses a traditional mortgage, and obviously seller financing isn't quite the same. 

Also, for a subject 2, once the mortgage is paid off typically what happens? This is a gray area for me. It seems that majority of people lease option the house, so they create a sandwich lease, but what if you want to hold the property? Does that make sense to anyone?! 

Thanks in advance! :)