You pick the model you want, print the design, cut out and glue together. Here’s a R2-D2 I’ve been working on for nearly a year now. (I do a bit in the evenings then forget about for a while, then pick it up again.)
What’s neat about this is the head rotates and the feet move so you can position it. A word of warning though, some parts of the model are a wee bit tricky to put together. Also the instructions are just diagrams annotated in Japanese so study them carefully.
Here’s a list of things I recommend to assemble complex paper models like this
* Sharp knife. A blunt one just tears, which is messy.
* Metal ruler. You think you can cut a straight line by hand? Bet you can’t. Also very handy for folding.
* Cutting board. Coffee tables are not recommended unless you live alone.
* Glue. Any paper glue will do, in fact that cheap white stuff you used as a kid is perfect.
* Tweezers. I use these to hold two bits of paper together until the glue dries.
* Nail scissors. Nice and small to cut out any curves.
There are loads of models on the site, now I’ve done this one I should look for another one to do. They’re perfect for doing in front of the tele.