@Danny Van- thanks  1) if you have some equity in the property - you might consider getting a HELOC in place now  in case you  want to use any  equity in the future ...Its  easier to get a heloc in place on a primary home as compared to a rental  2) contact your insurance agent and  ask for an  estimate for how the insurance coverage and premium will  change  3) consider  a proeprty management firm if you dont want to  self  manage  4)  get any forms and  processes  in place  (  leases / credit checks / bank accounts/  etc ....)

I'm embarking on my first direct mail campaign and I'm looking for some advice or tips & tricks.

I financed the rehab with a 0% credit card (i strongly do not recommend that if you're new) and so i had zero finance or interest charges for the entire rehab. 

You can really mess up the seller's credit if you miss payments and they can then sue you.4.

FTC, California DFPI Case Leads to Ban Against Operators of Mortgage Relief Scam Home Matters USA | Federal Trade CommissionOffering to buy their homes and "Save their credit" or "Save them from foreclosure" could innocently put you in the state or federal regulator's crosshairs.

I’m new in Dfw market and would love some tips

Also I've been doing a lot of reading on this, but would love to hear any partnership structuring ideas and tips.

With no debt and a 778 credit score.

Will my credit be affected once the bank forecloses?

If you did not then I see absolutely no reason why the complaint against the wholesaler's agent (I won't give him the credit of being referred to as a "buyer") should prevent you from re-listing your house.If you did have a listing agreement then I would suggest consulting a DIFFERENT broker as @Don Konipol suggested.