do you buy skiis by your weight? Are the boots easy to release in this package

Yes, you do buy skis by weight because the ski effectively just "feels" how much weight you are transferring, meaning that the heavier you are, the stiffer of a ski you need. Stiffness is important to get right because if you're on an overly stiff ski you won't have any traction (the grip area won't be compressed into the snow, which causes problems since the rest of the ski is simply designed to glide with minimal friction) and an overly flexible ski will slow you down because the grip area is constantly dragging (think of leaving the emergency brake on constantly in your car).As for the ease of release of these boots, this depends more on the binding than anything else. These bindings are fairly simple; just step in with the toe loop into the proper area and then to release, just press the tip of your pole into the little black release button directly in front of the rubber toe bumper.