@Mario Richardson Hey it's all groovy gravy, we all have to find our groove here on BP.

Stay open-minded, soak up all the info you can, and you'll find your groove in no time.

It would be best if as much of the original floor remained when you did that, that is, if the floor were not refinished at the time you sold the floor to a specialty vintage dealer.Blind-nailed hardwood strip flooring like this is always shaped into a tongue-and-groove configuration.

If you see nail heads in the long edge grooves you’re likely out of luck.

As I understand, the "click" versions are not nailed to a subfloor, but tongue-and-groove glued together designed more for DIY. 

Currently closing on a VRBO I expect to cash flow $800-1000 per month right out of the gate and $1500 once it gets into the groove and a few small repairs. 

I realize that is contrary to what most people do, but as a contractor who's doing and/or directing the actual installation and maintenance, it makes a lot of sense for usIn bedrooms, I staple in unfinished 3/4 in. tongue-and-groove oak with 3 coats of oil-based poly to finish it.

Any tongue and groove, locking flooring may come apart over time with an unlevel subfloor.

Secondly when you're not working 2-4 open houses a weekend (yes that's a must when getting started) and having the 30-60 minute coffee appointment, focus on establishing accountability partners (brokers who have also started recently or in a similar groove as you), listen to podcasts or read books, and work establishing good habits early and developing a good mindset. 

Husband used to do  some residential real estate a while ago and we are now getting into the groove again.