It's going to take sometime but consistent effort will bear fruit for you.

Im planning on living upstairs which has a big finished attic and renting downstairs which has basement (huge) access.Im thinking of building a wall separating the basement (one side w only access to laundry machines) & one (just accessible to the downstairs unit.

It took me about 6 months to build this operation from scratch, because I had to make adjustments on the criteria I wanted apply in each of the verticals (I ended up with 9 channels), figure out how to get this info in the first place, then put in procedures to automate this process somehow (I started off with hiring VAs overseas, which in itself is a learning process, and now with the help of my IT friend who has partnered up with me, is in the process of automating the data extraction process using AI/machine learning). 

I'm sure you will get some fruitful responses from this post.

Over the past 3 months I’ve been a machine, listening to podcast episodes everyday, scouring the forums for posts to learn from, reading every guide I can get my hands on, and I’ve got several books in the mail that I can’t wait to read (Long Distance Real Estate Investing by David Greene & The Book on Estimating Rehad Costs by J Scott). 

Plumbing from the "old" washing machine hook-up could become shower stall (tub is not an option).

Selling on amazon (FBA) has been fruitful, but requires some capital and time. 

For products catering to the middle/upper-middle class, you're not going to find such low-hanging fruit in any major market. 

Even so, assuming an additional $5k in expenses, you would still be creating $10k AND have a cash flowing money making machine. 

It has been often suggested here and elsewhere to pursue something that keeps a toe in the water of the working world, as it limits the downside risks, and could turn into a fruitful enterprise for post-retirement.At the request of a friend and BP associate, I've been asked to provide expert opinion and electrical analysis on residential properties that are either on the market, or recently sold through his brokerage, as there are many customers who want a deeper look at their electrical system, deeper than what a typical home inspector will do, but they are not ready to ask a contractor to come out and simply give a blank check to 'fix whatever's wrong' (famous last words).