AS already noted the Lyman manual is probably tops for ID and info on most available shells. Pick it up and your pretty much set. Then you can cross reference through the powder manufacturers data as well.
When I was shooting shotguns, I shot close to a case a week, and loaded them all one at a time on a simple little Pacific DL - 105 press,(
http://pacificreloaders.awardspace.com/Pacific%20DL-105.htm). I got to a point I could turn out about a box every 15 minutes or so.
I still have it and it will still load very quality rounds even though it is a cheap press. To learn on it or similar presses are great, as you learn to set everything up and can instantly inspect what your doing. They will load just as good as any of the high dollar ones do only a tad slower. However once you get your load set up, your in business and can get into a groove and rock right along.
The only issue I ever had was the shot bottles breaking off at the neck. Of course this only happened after loading thousands of rounds, and after the first time, I knew what to look for. Besides I didn't want to spend all morning chasing #8 shot around on the floor.
Good luck, no matter which you choose to get. It is as fun as any other and the best thing is you can generally substitute the shot sizes for the identical charges, as most meter through bushings. With the bushing, the size only matters once you get to the shot that you need to count per shell, as only so much of any size will fit in a given bushing. I used the same bushing for #4 - #9 shot and all worked very well with the loads I used. I do highly suggest the Win AA cases as well, they will last through many loadings with field loads and also stand up fairly well to heavy loads.