Deductions & credits

Good day!  I have a similar scenario:  I have a property that I am developing for short term vacation rentals. I am trying to figure out what I can deduct. There are three homes.

 

1. One we live in.

2. One we have rented out for a couple years now (as a short term rental)

3. and one thats under construction (future shot term rentals).

 

Thanks in advance!