The main issue is your exit is capped so if your costs go up, your profit goes down.

Recently, my mother has indicated her wish to sell the family property where I grew up in Isabela, Puerto Rico.

I did not realize one of my units had the 7-night minimum but that currently is a requirement in my city, I do not always follow it.

Do you know of any websites or platforms where I could go to analyze and practice seller finance and creative finance deals?

Yes you partner with them on the individual deal but you get the reps in to become better at watching a deal from start to finish. 

Massachusetts has a 5% state LT capital gains tax, but it generally follows the federal exemption rules.If the home was a rental property, the exclusion does not apply, and you may also owe depreciation recapture tax (typically taxed at 25% for federal).

Another would be you are building other units next door/nearby and you can chalk this build up to the "learning curve".I didn't see a CFO on GLH or GLC's website, but I'm sure you have someone doing this type of financial analysis for your developments?

The masterminds often encourage students to finance the new-car like entrance fees on a credit card, on the promise of just a single deal covering all the entrance costs. 

I made sure I followed everything you mentioned.

I do not personally use him based soley on the fact that the firm is virtual.