You also need to check with the utility companies and get cost estimates from them for availability, fees, hookup charges, transformer and power line/power pole locations or relocation requirements, water, sewer, gas, cable etcThis is just a quick high level overview of the process but will give you some things to think about and a good starting point.

It can be closed off from the rest of the house, but the laundry would have to be relocated.

I'm relocating but all my offers are outbid by cash buyers (mostly). 

It sounds good in practice to keep exchanging to larger properties, but at some point you get old and tired.

In practice as a CPA, we’ve had 2 clients end up in court disputes because of lousy/online OP agreements.

Fixing for a flip and a rental are different and it's best to go to the people in your area to see the best practices and to network with wholesalers you can find deals from.

Going through and checking the other properties on the market manually is a great practice every so often. 

You are not required to get an EIN as a sole proprietor, but it is best practice.  

SEO (of course).SEO gives you an infinite ROI because the leads are (practically) free.Not only are the leads (practically) free, they are also the best possible quality leads any marketing venue can provide.Thirdly, you only start to spend effort on these leads AFTER you know they are motivated and want to sell (to YOU).

If your end goal is to learn how to analyze deals, then I found it very helpful to do practice deals over and over again in a notebook that I had kept.