But in following years, I plan on just using the profits to reinvest.I would love to hear any advice on which entity to choose (from both a tax and legal standpoint), when I should incorporate (I'm guessing before I close on my first rehab?)

Home Improvement appears to only require proof of incorporation and the appropriate level of liability insurance. 

It's 'Incorporating".  

Set up an LLC with articles of incorporation, EIN and an operating agreement.  

Was he an incorporated Entity or just a guy loaning money out?

Then give the proper legal notice, as required for your jurisdiction, for making a change to the rental agreement to incorporate these policies.

But as long as you know this going in and can incorporate the cost into your numbers, it will be fine.

or if was thc, or cbd?

With a House Hacker Podcast, it would probably be harder to cash flow if you incorporate the repair costs into the mortgage monthly payment right?

Can someone please explain to me how to get articles of incorporation??