Go Engineer, it's the easiest class to level and you will literally never die (if you play correctly). Put your points in int. Also, use a shield/pistol combo. You will need around 300 plat to reach level 40, then another 300-400 to reach 41. 800 will be enough. As for skill setup, there are lot's of guides, but make sure you max Leech, Empathy, Transference and a couple points in Force shield (for energy regen), the rest of your points can go into the various attack skills (I use Wither (max), Decay (max), and Pain). Be sure to put one point in revive and use it routinely, it has a hidden mana regen and damage buff). Don't really need suppression, protection, or sonic boom. Have Fun!