Cash deal convert to financed?

[Kristoffer Bergen]

I live in WA state and have a deal in TN I put an offer in on. All cash offer - the only way I could obtain the property and the plan is to rent it out . 

1) Should I start an LLC and in which state? WA or TN?

2) Can I convert the all cash deal to the LLC at closing?

3) Can I convert the all cash deal to a financed deal post closing?

Any help would be appreciated.

Kris