If you go with an Architect you can save a lot by using the same plan in different locations and pay a reuse fee instead of a full design fee.

The only differences are 1) the beneficiary of the loan is not you personally but your SD 401k plan and, 2) all money in and out must stay in the plan.

I've used lots of different platforms, Wordpress is a good one (you'll probably want to host your own website so you actually own it).

There's a lot to unpack here... and it's not my goal to be a 'downer' on your aspiration... but just telling you my experiences to caution you about being new to the game...First - I don't think we know what state you live in, so just know that foreclosure auctions are handled very differently all across the country.  

Every case is different.

Commercial and residential are opposing forces in NJ (and most places) as they run totally differently.

I know everyone is different.

If different lenders, many will require a 6 month seasoning period from when you purchased the property to rehab.

There are a number of issues with tax sale properties and I'm sure they differ somewhat between states.

@Jonathan E Francois Hopefully, you've already found different opportunities, but If you're still wondering, I would check out these guys: Multifamily strategy.