What do you need help with?

It's an estimated cash on cash return given current rental rates subtract expenses assuming 7% interest rate, 10% management fee, 5% repairs, 5% capex and other expenses like mortgage, insurance, tax. it's a estimate to tell you what properties to analyze vs ignoreyou can see the are pockets of negative returns as well as pockets of positive return. this is to supplement the data @Devin Conley provided

If you find someone giving you confused looks, seek a mortgage broker that helps investors.I'm not so sure how they would calculate income from short-term rentals.  

I think having it in writing from a plumber would help this case a lot.

if not, you should behope this helps

It's not quite as easy as renting out two sides of a duplex, but with the right marketing and management you could rent out the extra unit to supplement the mortgage payment. 

Adding and making better could sell or rent faster, but it won't get you more than what the market ARV and rent is set at from other similar comps in the area....and your Interior Design background will help, if you you it mostly as an understanding of cost. 

Any help or advice would be appreciated. 

Happy to help Eli! 

Here are a few tips to help you get started:Financing: Since you’ll be starting your internship soon, lenders may look at your projected income or require a co-signer until you have a longer work history.