Lots of variables.

However, I'm sure there are substantial variables which will ultimately impact profitability, and my mental health.I have a crew in place, plan to pay cash {at least for the first few transactions} and understand the first few deals may not include profitability.Are you familiar with Golden Lakes in West Palm Beach?

Variables you have to think about: do you have a down payment, how long will you be in the area, how much is rent vs a mortgage, etc. 

It seems like a purchasing frenzy is ready to erupt if housing market variables change. 

Everybody is different when it comes to mark up, several variables need to be taken into consideration.

Like said previously, buying an investment property involves quite a few variables.

Obviously I know these numbers vary immensely on a lot of variables but I am curious into this side of investing.

The other variable is next year being an election year about mid year before people go to the polls, if inflation is still bad specifically food and housing, plus unemployment has gotten worse, and housing gets worse.

Typically HELOCs have a variable interest rate so make sure you take that into account. 

I recommend you do this each year to adjust for utility increases and other variables.