oh god, u have a d70 and dont know how to shoot sequences? well i dont own that camera but im guessing its either a setting called burst usually or u just hold down the shutter button and it will automatically shoot in burst mode, and to put them together you need a photoshop program
1. get a tripod
2. set up your camera in burst mode and all the other setting for the appropriate lighting
3. hold down shutter button for sequence
4. In photoshop layer the skier cutouts of the skier against the background using some overley blend mode
you should be set
If at first you don't succeed, failure may be your thing-Warren Miller
I should clarify.... spins on to rails might be cool, but mostly, 2.5 is too slow to make good sequences. Jumps won't look good because it's not fast enough to capture enough action to make an interesting sequence. you need somewhere around 5 fps to make a really god looking jump sequence.