Take a close look at what other similar units look like on Zillow or other online listing sites and try and mimic them or exceed them.

You might spend between $5,000 and $20,000 on furnishing the unit, depending on your choices.

Keep in mind this will be at a much higher rate than your current 3.2% interest rate, so I'm not sure if paying off the existing loan is a great choice.

@Keetaek HongI use QuickBooks Online (QBO) for my flipping business, rental businesses, and bookkeeping clients.However, many on the forums will advise against QBO.

If you purchase online, find a retailer that has the delivery window at the point of purchase.

https://www.biggerpockets.com/forums/93/topics/67638-where-to-find-wholesale-contracts-online

Here's the handbook link https://dca.georgia.gov/housing-choice-voucher/landlords/geo...I strongly urge you to consult an attorney.

You can create your own, or there are house flipping spreadsheet templates available online 

If there are barriers that limit similar supply and you figure out how to get the housing units online, even better. 

You can also check online resources like BiggerPockets or Roofstock, which offer general CapEx guidelines based on property type and age.These methods should help you perform a solid preliminary analysis.