Raspberry pi 5 noob help 4/5G, gps

Hello all!

I am new to all of this so I am looking for your expertise.

I am going to be building a computer and touch screen to fit in the dash of my race car instead of lugging around a laptop for tuning purposes.

I preordered a Pi 5, 8gb starter kit but want to get everything together now for whenever my kit actually arrives.

-I am wanting to get a data only 4G or 5G plan so my car has internet for my tuner to be able to remotely log in to my computer/car and view data in real time as I drive. What do I need to accomplish this?

( It would be a huge bonus if it somehow also had gps so I could use it for a speedometer)

-what power supply could I use for the Pi 5 and the 12v DC system the car runs off of? I would like the pi to run off the 12v system

Sorry if this is annoying, asking to have my hand held through basic stuff but this is my first Pi kit and there are thousands of modules, add ons, boards etc so please forgive me

For 4/5G, get a cellular wifi gateway from your cell phone provider.

For power use a 12 volt to 5 volt DC to DC converter.

There are usb gps dongles available for gps that should work on a pi.

I don’t believe sparkfun has these products.