Thumbs up HELLO ALL :D [Need major help with everything]

Soooo, i'm new to this rooting android whatever stuff.
I was in the jailbreak community for iOS and understood everything.
And since i've had a nexus 5, I searched up rooting or roms or whatever they are called AND IM SOOOO INTERESTED!!!!!!!!!!!!!!!!!!!!!!!!!!!

and I JUST need alot of help!!!!!!!!! lol
I'm a MAJOR NOOBBBB, I'm sure I "rooted" my nexus...... and idk
im soo confused, I read stuff on how to do this,
but they say you have to go into your phone storage
and I DONT KNOW WHAT Or HOW TO DO THATTTT

NO clue what im doing, & i just want my phone to look smexiiii by tomorrow lol

So if you can help me, that would be awesome!