Tom beat me to it, but I was going to recommend you start with the Sugar Barrel or the Billy Budd, they should both be easy to pack. There are lots of opinions and techniques for filling a bowl, but I started this way: youtube pipesmagazine - Bing Videos
The key is to just relax and go with your gut. There are techniques that will improve your smoking over time, but for now just have fun.
edit: dang, he beat me to it again!