Anyways just use the search function and you’ll find lots of threads on personal finance and how to invest in multifamily.  

Use the search function on "househacking"

But you'd likely have to overcome the objection of why they should let you in on the equity site and not just let you live onsite and perform those functions as a job...Time is money... and if you don't have money you should have the time.

Not sure what your payback will be if you rehab, but if tenants come and go, I bet they will be content with clean, functional and fresh paint in a light color.

I would recommend you do as many of the calculators under tools to learn how they function.

The problems are “deep” problems in crawl space, in the rooms it looks rent ready- that is how I and the realtor felt when we walked in: Clean carpet, rooms, kitchen, bedrooms, functional AC, and other appliances included in the purchase.

I am also unsure of a search function, I could have swore there used to be a forum search bar?

c) the seller asked them to do it on the cheap and it will still function and not leak but isn't the best way to have installed it. 

Some examples here are additions (adding square footage), changing floorplans (making a house more functional), adding bathrooms or bedrooms (changing the buyer demographic), tearing down and rebuilding, etc.

Feel free to DM me if you don't feel comfortable broadcasting the location information.