What should i be doing?
If this is your first character, I would highly advise using a slot to level a toon up and play through naturally to learn the game. The boost is more optimum for Veteran players who want to skip the levelling process and try out one of the new expansion specs.
If you are adamant on starting from where you are, I would start in the map you are on and explore, do the early story and proceed from there. Maps downscale you here to keep everything relevant so you wont be too overpowered.
I, too, would suggest you park the boosted character, create another character, and play through Core Tyria naturally. Boosting a character means you miss all the tutorial tips offered at each level-up.
Explore the entire map, play through the Personal Story, and familiarize yourself with all Tyria has to offer.
Welcome to Tyria, and good luck.