One-person rental units are in the highest demand, and co-living directly appeals to this market.

I was thinking if I can talk to my neighbor about sharing the cost (I, the landlord, personally provide labor and my neighbor provide material (e.g. fence pickets)).

That person will be able to tell you what you can do and following that plan will give you peace of mind about your further investing strategy.

I have no experience personally investing with them.   

Personally, I wouldn't offer SubTo or a Wrap, For reasons I've written about fairly extensively. https://www.biggerpockets.com/forums/70/topics/1227199-the-m...However, I would sell on "Lease Option" and that may work for you.

Any recommendations on Houston REI groups that meet in person or virtually?

they're not magic.are you going to in-person / informal meetups? 

My goal is to wholesale some properties single and multifamily to build some capital while fixing my personal credit and building my business credit.

It also gives you multiple work surfaces so you can have more than one person in the kitchen without getting in each others' way.

I'm still in the learning phase and have read about a hundred different books on FI and personal finance.Looking for any resources that might help me on my way.