As you will learn in Destiny, just grind it out dude. Keep moving forward, play every chance you get. Run the public events, do the adventures, do the patrols. If you do that you will be level 20 before you even finish the base story line. I have 9 characters across 3 platforms and I have reached 20 before I did the last base mission.
Patience and time.... D1'ers will get that one ;)
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Ah, a fine rifle!