What tricks should I learn?

Great question. If you can ski switch, then you have the 180 down, then the 360 (on rollers) 50/50 on a box, box slide(90-degree turn), Straight air, Shifty, safety grab, start to do rails after you get the box slide down (there are all kinds of forums on how to do this), 540, 720, tail and nose grab, truck driver, blunt, nose and tail butter (if you have twin twips). http://www.slvsh.com for a list of grabs.

you have to learn dubs in your first year of park or you'll get made fun of and shunned by your peers, trust me

Learn to 360, then backie. That's how I learned

Hit jumps while sitting on your skis and dragging a hand on the snow. With just a straight air, it actually pops you pretty perfectly and you'll land perfectly. obviously that's not some cool trick, but if you're pretty new that may be a way to get comfortable with that style then you can start going for hand drag spins and stuff. Few people do that stuff so it'd be that much cooler if you had that in your bag--if you're trying to develop a unique style.

Kick-ass blaster.

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This is the only trick you need.