How much later?

I'm currently a E/N at nolani academy and i don't really like my build at all. My friend told me that later i could re-choose a second class? Should i play it till then or create a new character? How long is it before i can rechoose second class?

It will be quite a long time, and I believe you can only change you secondary profession. By the time you change your secondary profession, your character's level will probably be in the high 20s.

Hmmm, if you're at nolani, you done at most 3 missions and have something like 15 more to go before you can change your secondary. Kinda Ouch. I played E/N all the way to ascension and still play it at times (when I solo) and I quite enjoy it. But if you don't, I'm not sure starting over wouldn't be better than playing over half the game with a build you don't enjoy playing.

Even if you make it to the sub change, best to start over rather than changing sub later. It will be faster the second time around since you'll know where to go and be able to get sp easily. They really need to start refunding SP's as well as dropping the skills when you change sub. IMHO the sub change quest is rather bogus as it is right now, totally not worth it. Much faster just to make a new char and speed through the game.

When can you change your 2nd profession? I am on my final ascension test right now, do i get to change it after i ascend?

High 20's? Max level is 20

Once you've ascended you can go to the 3 outposts, the ghosts there will offer you quests that you can undertake. If you succeed then you can change your secondary profession appropriately.