I am undecided if I should repair it and rent it out or should I  repair and sell it ( fix and flip) sort of.

Often times this is a "ask for forgiveness than permission" sort of scenario.

If your goal is assume a loan, I would offer the lender some sort of compensation as they are generally only paid if they write your loan, which is not the case with an assumable loan, as the current servicer will be underwriting and providing the new loan.  

As far as your wholesaling journey, I would probably advise you to start off by buying a list of potential motivated sellers, skip tracing them and then cold calling them.  

Might be cheaper to run a vent of some sort. 

You'll likely need some sort of collateral. 

I’d love to hear who you’ve used in similar situations, or what sort of rates and terms could be expected.

Even the few no money down deals I have done wasn’t really no money down deals, because I spent thousands upon thousands of dollars in marketing  and typically I had to do some sort of rehab to the property once I got it.The last Sub2 deal idea I had to give the seller $17,000, pay all the closing cost, repaint the whole house, and make payments on the thing three months while I was getting it ready.The one before that the guy was behind almost $7000, I had to change the carpet, I painted the whole house, I made a number of payments while I was getting it ready, and I paid the closing cost, and I probably spent close to $7000 on a marketing campaign . 

Anyone receive calls from motivated sellers using the app?

The primary motivations for purchasing an LLC that owns the real estate is to avoid the potential of a significant property tax increase and to eliminate conveyance fees.