If you're crossing over from skateboarding and you've never skied before, the ski's are definitely going to feel heavy.
Between the boots bindings and skis you're strapping close to 15 lbs to each foot. If you weigh around 150, that's 20% of your body weight.
Once you get used to carving, etc...you wont feel the weight of the skis as much anymore, once your edging gets good, the skis almost feel like they propel you.
In terms of jumps...just work up to the big stuff. When you get into rotations, think more about spinning your head/body than your feet.
It's all good, you'll love it after a few times on the slopes. Welcome to skiing, pretty soon skating will just be to kill time in between ski seasons, haha.