Welcome to FIRST on your rookie year!
Youtube is a great source for finding all types of lifts. (Ring it Up, is a good year for lifts)
Both of my teams that I mentor are using a "drawer slide" type lift. We bought the drawer slides from our local Home Depot. We then added sheets of metal between our slides in order to hold all the pullys for the lift to go up. On the back of the lift we are going to have "drums" or "barrels" to collect all the string that brings all the lift up. If you look at one of our twitters, there is a CAD model to give you an idea sorta of our lift.
https://twitter.com/trojans8640