Just curious, why would you want to buy on land contract? Also, do you have your present home up for sale?
My suggestion is to wait until you get your present home under contract before finding the next home to buy.
Even with the land contract you will likely need 3 1/2-10% down payment and you will need a relatively clean credit report.
If you would like to discuss this further, feel free to contact me at firstname.lastname@example.org or call 574-214-2746.