If you want to raid, I actually don't recommend a relic; it's very very long, Heavensward is but 2 months away, and you can get an i130 weapon much faster.

There's a guide to gearing up in my signature but the short answer is you'll want to get i110/i100 ASAP. There will be a lot of new dungeons since you played so take advantage of first time soldiery tomestone bonuses. Once your ilvl is high enough, you'll want to start running "expert roulette". This dungeon mode will cap you on poetics before the reset with time to spare if you can run it every day.

If you can't do it every day, PVP roulette is another 40 poetics/80 sold for doing almost nothing. In fact, PVP roulette is available much sooner so you might start there for earning poetics.

If you can stomach World of Darkness, you can get i120 left side pieces there. Poetics is sadly still under a weekly cap; WoD and FCoB are not. You'll probably want to get some WoD pieces as, at this point, not many raid groups are going to take someone in i110.

WoD and the other CTs have a weekly quest. The Encrypted tomestone will get you an i130 weapon. Hunts will let you get upgrade items (carbontwine, carboncoat) faster than the CT weekly.

Welcome back and good luck!