Whatever you do, don't listen to people who advise you to "boost". Earn your stripes the correct way, it's much more satisfying and you won't get to level 40 and realize you suck at playing the game because you simply boosted your way there.
It's not easy to boost in this game. You can't start the game until you get six people in the room, and good luck trying to convince all of them that you are only interested in boosting for the achievements.
Besides, it's not difficult to level up. In the two days that I've played online (totalling about three to four hours), I'm already up to level 15. Just get out there and play.
"lol" has become the new word for the term, "I have nothing further to say."