Looking for additional info on a prusa i3 acrylic

I finally had the time and space to pull my prusa i3 out of storage and I have figured out that I need lots of help to begin printing again. Five or so years ago I purchased the printer kit from someone in hong kong. Across the top of the printer it says 'Prusa I3 Czar' and its similar to this printer so im gonna assume that I'm correct. My primary issue is I'm not sure which software to use with it. It has a ramps 1.4 board connected to an arduino mega. I haven't found much info about which firmware to use or even a tutorial for making my first print. Any help is appreciated. A link to a tutorial that would walk me through uploading the firmware and setting up the printer software would be great. Thanks in advance.

Firmware is you choice.

In my view only 3 real choices in order of my preference

Marlin2
Klipper (needs a controlling pc always, rpi is fine)
Repetier Firmware

Control software, start with pronterface/printrun

slicer software. Slic3r or PrusaSlicer

you start with firmware and configure it for your hardware.
You can work out most things except thermistor types, but a machine that old is very likely to be type 1