Lawyer’s wet dream. 

I agree, it's important to really understand the basics and start small to get your feet wet.

Quote from @Silas Melson: I’m trying to get my feet wet in real estate investing, but I’m drawn more to the passive route.

Hi Guys hope your having a wonderful day im looking to Work for someone willing to teach i know alot already but You tube dont mean Squat i need hands on Experience with someone with Wisdom in this industry that can help me get my feet wet in a controlled environment and i think working for people that are already doing big things in real estate will help more than just going on your own Iron sharpens iron.

Running through some dry scenarios with brokers and lenders would be a good way to get your feet wet.

There were wet clothes in the bathroom floor and clothes and dirty dishes and rotting food all over the place. 

You're looking for finishes that hold up to wet glasses and don't chip, upholstery fabrics that don't stain, and furniture that doesn't sag or break.

Wet spot.  

The first being - don't bring your friends or family into the mix :)Since it sounds like you're pretty solidified in your friend moving in, and it could be a good first roomie, so just to get your feet wet... i'll double down on Laura's advice - do a lease, for the legalities, but i also highly recommend some sort of written (we call it a) Room Mate Agreement.

My recommendaiton would be to build the ground level as a "wet basement".