A few Questions - Curiousity

[Lynkz83]

I have a few questions, i could be going blind or becoming slightly dyslexic.. even tried searching for how to and howto didnt really turn up what i was lookin for i thought id just ask

i havent been able to find a tutorial/walkthrough/how to on flashing your phone with a different rom, anyone able to point me to a step by step?

the majority of users i see are using bigger name cell phone companies, will flashing my phone with a 3rd party rom fubar the phone to the point i cant use my cellular network?

would flashing the rom erase settings for the cellular provider, where do i find the settings the provider set to back them up?

sorry if these have been asked, but a response would be appreciated, im new to phone mods, my router was much easier to flash apparently so any help so i dont kill/brick my phone would be great

thanks in advance