Welcome aboard and you came to the right place. You have decided to go with heat pressing with vinyl, plastisol, and
jpss paper.
1. You will need a heat press.
2. To heat press with vinyl you will need a vinyl cutter.
3. Plastisol transfers can be custom ordered but if you want to make them yourself you will need screen printing equipment.
4.
JPSS paper just purchase, print your design with your printer, heat press onto the shirt.
Now as for the where to get the equipment you will find many here that have different opinions about different equipment types. You will have to do some searching on this forum to get a better idea for what is best for you and your budget.
There is A LOT of GREAT information here so I suggest you take some time and read up on the many post in which you have an interest and you will get most of your questions answers.
Veedub3
Good luck!