Proof of funds in a Connecticut deal

[Andres Bernal]

I found super slam dunk deal here in CT. I'm going to make a cash offer and I have an investor with the funds that I'm going to fund the project with. Since Ive bought all my rentals with conventional mortgage I'm a little lost. 

I have couple of questions, 

1. When I'm making the offer, what kind of proof of funds from my investor is acceptable for the sellers realtor?

2. Can I make an offer with my name only, use my private investor proof of funds and then create an LLC with him and close under the LLC?

Thank you guys!