Root [T-Mobile] rooting my N3 for first time Ever!! need help

Ok my fellow Phandroid members after having the N3 for 5 months now i would like to root and install a custom rom i have had prior experience in the past on rooting simple phones talking back in 2012 with all this new stuff about tripping knox and using odin or using a recovery method i have no idea what im actually doing to root this phone and start enjoying the benefits that rooting has to offer so first thing i am running on 4.4.2 version since having the phone i have updated the software everytime my model is SM-N900T if anyone could please help me figure out to root and to install rom i would greatly appreciate it please private message if like or leave a comment Thank you.