Visio has a solid financing product for STR's 

I have solid credit and good cash flow.

I'd also recommend when trying to contact the owner you do so after gaining a pretty solid feel for what the home is worth or what an investor in your area would pay for it. 

I am ready to purchase my first few properties in Chattanooga.I travel to Chatt fairly often but would like to have a more solid feel for the area in terms of where to place my first investment, I am currently looking in Red Bank.Though I don’t plan to rent immediately..I will likely house hack for a year (ideally with a MIL suite or basement) and rent it out afterwards while I then focus on getting a stronger foothold in wholesaling.

Option #1 sounds good.Look at your Option #2:You have already planned to wait 4 months to save 3k on your current REFIYou are increasing your pool of cast at 2k per month, a projected +8k growth in your cash pool.If you put your cash on that pay down, you say you will save ~1k  (equivalent to 1/2 month) and you take your self out of the market for your second investment for 4 or 5 months.Just be sure to hold your horses for a new investment that has solid cash flow and not be depending on current appreciation rates.Your focus on REFI makes me wonder?

I will be turning 18 in a couple of days  I only have 4 months of solid work experience so far, what is another way I can obtain a pre approval letter for hard money with limited history in work, and no experience in real estate?

Your father did you guys a solid and everyone should benefit.

I'd like to develop a solid business plan but to honest I'm not sure where to start or what all to include in a well formed business plan.

Solid acquisition.  

Solid vinyl plank flooring does not expand and contract.