I plan to do creative finance offers on them.I was thinking of offering $20 per lead plus $500 per deal.

FHA requires 3.5% down payment, so be prepared with the cash that you have to cover that.  

I have solely invested in residential suited properties until now but I am trying to prepare for a shift to larger multi-family when that program launches.

You need to ve prepared for high CapEx, the "rehabs" in the area are really bad.I would recommend going standard not FHA, and gave a good cash reserve otherwise you will be in trouble

Are there creative ways that incentivize wholesalers to work with investors looking for seller financing?

We got the home at a great price, fixed it up, added an in-ground pool and are looking at turning it into a long-term rental as we prepare to move again.

However, if you do plan on the entire project taking over a year, so be prepared. 

Anybody has a good script that I can use too talked too sellers, buyers, creative finance Approaches etc.I talked too Multiple sellers and buyers but sometimes I get stuck and forget what too say and lose my train of thought.

It will be my 1st time.What should I be prepared for?

it is all about being creative in your offer and making sure that it is align with what you want, but also satisfying the sellers needs.When you are looking at expenses, get a rent roll, 12 month maintenance history, any renovation background etc.