Some issues you might face are 25 year amortization and balloon payments. 

I have sent out roughly 1,200 letters since attending that course to hopefully find some sellers motivated to sell a house, but so far i've not found much. just curious how others first flip was like?

That will keep your personal things safer.Another thing you will need is a loan letter showing that you have been approved for a loan and state how long it should take you to close and the maximum amount you qualified for.

We just want to make sure we have the right information before sending the letter.

It's a 3 bed, 2 1/2 bath in a decent neighborhood, and I submitted an offer 5K over asking price (the market here is brutal and I keep getting beat out), as well as submitted a letter to the seller in hopes of making my offer stand out. 

If you are sure that you can raise the value of the property significantly, tell the home owner you can buy it with a balloon in 3 years or so. 

You did not mention your money status in your initial letter.  

@Matt Ritchie the situation you describe really gives you the flexibility to choose which way you want to create the financing.Option 1: The local banks/credit unions will probably agree to get all 4 duplexes under one commercial loan:Pros: one set loan fees, one set of books, one tax filing companyCons: Balloon type mortgage, shorter amortization period, all properties will have to be under one entity and you normally won't be able to sell just one of themOption 2: Separate loans (local banks or even the big banks)Cons: 4 sets of loan docs, feesPros: you can get a conventional loan with a 30 year fixed for each property, you can partner with different partners foe each property, you can get partners to be the loan guarantors separately and you can sell each duplex off at any given time.

I'm new to wholesaling I sent out my first direct mail letters to houses that I saw while D4D!

Also are these fully amortized or interest only with a balloon payment down the line?