Everyone and their Rikti monkey has been trying to farm the AE, but all the good exploits have been closed, so the remaining missions will consist of wannabe farmers throwing themselves at foes way outta their league and getting wiped. It's depressing how they keep at it. Best to avoid it unless you get some good arc ideas, the AE is more suitable for veteran players who've done all the good canon content.
Speaking of which, the Hollows-Faultline-Striga-Croatoa course is reccomended for levelling, though in Striga you might have to join or create a SuperGroup (guild) with a base hospital and teleporter there, it makes things easier.
Other newbie basics:
Missions are the way to go for levelling, they automatically spawn enemies suited to your level (adjusted by your difficulty settings, see a Field Analyst for details). Street hunting, while viable, is considered rather quaint, and not really reccomended until you know the zones a bit better.
Origin does not matter. Its effect on gameplay is all but cosmetic. There is the perma-temp ranged attack power you get at the start, but generally that won't be much use for very long, especially on a Blaster who has no shortage of better attacks.
If you get tired of playing the same character, or see something else that looks interesting, feel free to make alts. You can make as many as you want. It's actually considered kinda weird to have under 10.
The game's canon contacts outside the story zones are kind of a crapshoot- there's nice story arcs that give Reward Merits, but some will keep sending you the game missions to visit the entrances of PVP zones, street hunts in areas that are likely to be out of your league, missions on the other side of the game and other annoying pointless things. This kind of content is considered outdated and newer contacts have none of it, but the old stuff is still the same.