[Q] I honestly have no idea how to even begin. All guides are 1-2 years old. topic

I'm completely new, been reading the forums for a good 2 hours. Can't figure it out :/

T-Mobile Galaxy S4.
Model: SGH-M919
OS: 4.4.4
Baseband: M919UVUFNH7
kernel: 3.4.0-2437203
Build Number: KTU84P.M919UVUFNH7


I don't know where to begin. Sorry for being a noob :/