Analysis - Trade 2/1/1 w/seller financing for 2/1/1 paid off

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How would you structure this deal?:

Seller:
Residential - Single Family
2/1/1 Livable/Fair-Poor Condition
Appraised at $28,000
744 Sq Ft
Wants to sale their house and buy my house.

My House:
Residential - Single Family
2/1/1 Livable/Fair Condition
Appraised at $25,000
840 Sq Ft
I will finance it for $36,000 with 10% down for 15 yrs at $377/month

Where do I go from here?