@Sebastian Scott I can answer on these questions a little since I've done a few seller financing deals, most are out of state. All mobile home parks
1) The title company closing attorney can prepare the promissory note and loan docs. They incorporate this cost into the closing costs. It's not complicated at all.
2) You can usually put that into the purchase and sale agreement that allows you to do that. Talk to your real estate attorney about incorporating this language. Generally speaking, once you close on the property, you can whatever you want renovation wise. For mobile home parks, I need to clear with the seller and make sure he's good with me selling the park owned units. (if the deal was on seller financing, of course)
3) Include language about "non-resource loan and no personal guarantee". If the seller insists on personal guarantee, than make sure there is only one person and not your entire investment team. (I ran into this before). Make sure there is no prepayment penalties.
4) I don't think so.