You can also look into building a rental portfolio which is a little less hands off compared to flipping.

.: I haven't passed this past legal review so for what its worth: Part of my standard requirements for everyone include income is at least 3X rent, minimum credit score, say 640, Clean record and no evictions as well as deposit is paid in full at signing of lease and 1st month rent is paid in full prior to handing over the keys.

The GC is likely at least a couple of more thousand dollars.  

One last question - is your assistant actually hand writing the envelop?

We've learned many of these similar points first hand managing MTRs at scale.

Our standard lease is 27 pages long.We shortened to 6 pages for STR and MTR rentals only.Have had to evict a couple of tenants in Michigan and the leases were needed. 

I have yet to see an underwriting that holds up to my scrutiny that shows that adding a hands off single ADU in single family zoned area that projects a return that justifies the effort and risk.

We had a couple companies come in and give wild quotes to rework our system, then found a guy who showed up with schematics and trade journal articles on our particular system, spent 2 hours educating us on it, then cost about $500 to go around and fix all the crappy work previous "contractors" did to the system to try "fixing" it. 

This is something that I have really come to realize over the last couple of months as I've been learning.I came into this expecting it to be complicated, and I am not disappointed!

How to Invest in Real Estate and The Book on Real Estate Investing are a couple great books published by bigger pockets. congrats on taking the first step.