I've only played Doom 1 on my Nokia, I want to get familiar with the game, can someone help me get familiar with Doom?

Which means you haven't played Doom yet!

G4 did a four part retrospective on Doom a few years ago... Here's the first video in the series: https://www.youtube.com/watch?v=FuFT66omKiw

Other than that, you can find various reviews of the games to see them action. And of course, play them yourself

Thanks Pluto.