welcome to real estate. I'm also a full-time W2 and part time investor.
Geographically, I'd say go where you'll be happy living. It sounds like you plan to move somewhere and invest in that area. We prioritize our own happiness (otherwise, what's the point of all this) so once my military commitment is up, we'll be going coastal. That's where we are happy. People make money in real estate everywhere.
Once you have a region in mind (maybe you like mountains, or coastal, or quiet towns in flyover country) then do the research on good areas in that region for investing.
We also like what I call a modified BRRRR. We have 5 properties and live or have lived in 4. That means we have nice, cheap owner-occupied financing on them, largley eliminating the refi step. We also don't mind fixing a place up while we live in it. That helps us really know the house inside and out. Buy-reside-rehab-relocate-rent. That model will be changing once I get out of the military, but has really worked for us starting out.