To me he is asking for you to do a walk through video of it before he books it.

Lenders can choose to require a HIGHER score, but they can't allow a lower score if it'll be backed by Fannie/Freddie.

Welcome @Rebecca Morris,These are the 10 first steps I would recommend to get started in REI (real estate investing):1) Educate Yourself: Read books, take online courses, and attend seminars about real estate basics, market trends, and investment strategies.2) Set Clear Goals: Define what you want to achieve in real estate—whether it’s buying a home, investing in rental properties, or flipping houses.3) Choose Your Niche: Decide if you want to focus on residential, commercial, or industrial real estate, or perhaps a mix of these.4) Research the Market: Analyze your local real estate market.

After rehab, the ARV is projected at $320k, which could yield $55-65k in profit from a flip (after taxes), or a ~5% cash-on-cash ROI if we choose to BRRRR.

If you're wanting to put it into real estate, then choose a custodian like Advanta, Provident, Nu-View, Quest, etc that will allow you to truly "self-direct".

Choose which option you are going with. 

Does anyone have experience or advice on how to choose the right size?"

I personally would not choose to swap a tanked water heater to tankless at a rental due to increased maintenance.  

Each unit is 924 sqft.From what I can see in the video, it needs new roof.

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.