Hi Jay. If making your first
mod, you should start with an unregulated mosfet mod. If you are familiar with mechanical mods, it will function the same way. However the mosfet (a type of transistor wired into the circuit) will be switching the current.
Check out
NONAMé Box Mods Store he's selling out his entire stock and there are some nice deals at the moment.
Any further questions you're welcome to ask. You might also want to check out OpenPV on Reddit.