(assuming market does not crash etc).

What is the average spread in the market(s) you are in for flips?

It sounds like you have a solid, strategic approach, especially with a focus on value-add properties in appreciating markets.

I use Facebook marketplace as my way of marketing my rentals.

There's no real hard and fast way or only 1 way or doing your first 2 points. your subject line suggests you're not looking to go to a large shop like a JLL or a CBRE which honestly I don't blame you those offices are usually pretty bloated.As far as monthly costs, if you are going to individually get a costar or other such license you are probably looking at $500-$1000 a month pretty easy in overhead once you have office dues, mls dues, marketing, etc. 

@Sean Spagnola - I always like to have photos of recent comps in my back pocket to help with the design of a BRRRR to ensure that the finishes are similar/same to the market. 

We backed out of that deal because there was a freeze that hit Texas market, and that freeze caused a bunch of plumbing issues.

I would recommend you focus on a couple neighborhoods that you would like to live in; and familiarize yourself with that market.  

Spring may be better but I was unable to sell a cheap house in October for 5% off of “market value” and only sold a $600k home in January by listing it for $580k and I still only got one offer. ($150k down, 5 year seller financing.) my point being you may get $20-$40k more in a year if you don’t need to sell. 

Are you looking at investing in Birmingham or other markets?