+1 Bucklover,
Search the archives. Their is a lot of good advice along with pics, field pics, on the hoof, before and after shots, video etc. . . All of this will help you get started and allow you to practice field judging at home from your own PC. After you figure out what you are looking for and know the system and how it works, plan some time for scouting and looking at them through your binos and spotter. That is the best.
"Half of being smart, is knowing what you're dumb about."