Honest... not great but we had other tax reasons to get into them.   

If you have that experience, you probably don't need much marketing, as sellers will be reaching out to you directly.Focus on securing one listing at a time and building momentum.

One thing to take into consideration would be the overhead costs of being a cross-border investor, such as entity setup, property management, higher lending rates and tax filing should you choose to have a CPA.

I learned so much from the course and PCS, and I'm claiming all of my cost on my taxes.

From a tax standpoint, there are additional disclosures to make when selling a business asset for less than fair market value to a related third party. 

I recommend that you find a trusted or recommended Mortgage Loan Originator (MLO), who can give you options for property-based loans (mostly investment loans) and they don't use your taxes but the P&L of the property.

Out of my 32 properties, I’ve seen insurance rates drop by up to 40% on renewals, and property tax increases are finally slowing down compared to the crazy jumps we saw over the last five years.

I completely agree with @Ashish Acharya's points about the cost-effectiveness of a HELOC and the potential credit implications if it’s secured by your primary residence.

What are the tax ramifications of a sale, if any?

Most Florida markets will share some dynamics though like taxes and insurance.