one thing to find out as soon as possible is the games limitations.
most ppl who start off Red mage want to be a melee mage, who can be a god at everything.
Dunno why you picked it, but this game, unlike the more known MMO, WoW, the original concept was to be more custom, but they put into place limitations that really prevent customization.
Example, my friend wanted to be a Dragoon/Ninja dual Wielding Swords....
Works in FFT sure, but in FFXI, it doesnt. He got mad, threw fits at me, and said im just being an asshole, when i said not to be a DRG/NIN in our groups.
When he finally reached Lv60 as a WAR/NIN, he FINALLY started to see why.
DRG has (something like) a C~ in sword skill, probably lower.
Its possible to fight with a low score, but its better to fight with scores of A- or A+, you will miss ALLOT, accuracy is a b*tch in this game, until u get better gear/food to fix it.
Learning how to work as a group, be effective, and lower your down time, the more fun this game becomes.
The previously mentioned friend argued he DID have fun as DRG/NIN (claiming he was a god, but was BSing) and having to chose among the popular choices isnt fun.
But as he started to stop trying to be unique, and tried to be effective, he learned how completely different the game becomes, and how much faster pace it is. (if it ever feels slow, either you, and or the other group members arnt being as effective as they should be.)
Im sure ull be fine, if u have played other MMOs, but also, dont waste gil, as its hard to get. Once ur Lv50+ u can get free gear pretty much all the way to max level, but its not always good gear, just better than nothing if u dont have gil.
(also visit here often, but be warned, ur best bet is to listen, and not comment, or ppl will flame. but ull learn allot)
ps, excuse my horrid grammar.