So a bit of a necropost, but advice for you and anyone that reads it. Watch Jocat's "Crap Guides" to FF14. He has one for every role. Forgive yourself while learning. Be patient with yourself. Yes, I repeated myself.
Let people know you're new. The community is fantastic. I've been playing for 4 years and only encountered a handful of jerks. They are few and far between.
DPS is easiest to learn to do well, but Tanks and Healers Q up faster for raids.
ARR (The core game) is a slow start, but it picks up a *lot* for Heavensward.
Do the Mechanics and avoid the orange circles.
Seriously, watch the Crap Guides. It'll take about 20 minutes of your day to watch them.