According to their FB page, there are 2.6k users.

Theres someone living in the side that I will be occupying until the 1st of February, but since I JUST became the owner, would it make sense to reach out and ask them something like "Hey its __ the new owner, just checking in to see how you're doing.

Am I able to do a seller's finance for the remainder 25% with the owner and then do a balloon payment at the end of my term with both the seller and the harmony lender when I flip the property.

If you have 250k as the down and the rest hard including the rehab that is pretty intense.  

This would let you rent out the house for the next 3 years if you wanted and still get to take the gain.  

I would also purchase the property and not the LLC unless you are a seasoned investor with a good attorney.

Keeping it friendly and low intensity is more likely to be successful.I recently offered to completely replace my neighbor's fence next to my rental and they said "No".

Thanks Steven for the post. 

You can live in one unit and rent out the other for little to no down payment.

And since you are licensed, you can potentially do some sales on the side to increase income and save up for investing.