reloading
First of all, get a scale if you don't already have one. Absolutely essential. You can dump powder with a dipper and/or a spoon. A powder measure is nice but not essential.
A vernier or dial caliper is next. You have to watch the case length.
Good case lube. Lots of brands and variety here. Spray on, wipe on, whatever. I like the Hornady "paste" kind. Don't put it on heavy or on the case shoulders, just the body. Lube every 2 to 3 cases.
Be careful with the full length sizer die adjustment. You don't want to set the shoulders back on your cases. Size the cases just enough so that the bolt closes fairly easily, but no more. Or if you're shooting bolt guns, you can neck size the cases for plinking. Most authorities though advise FL sizing for serious hunting loads and using only once fired cases for serious hunting scenarios.
Get a good reloading book or two. Hornady's is good. So are Nosler's and Sierra's.
Subscribe to "Handloader Magazine" (Wolfe Publishing, Prescott AZ) I'd also heartily recommend Ken Waters' "Pet Loads" book. Fun reading and very informative. You'll learn lots of good stuff there for sure.
I don't know that I'd want to load shotshells on a single stage Rockchucker conversion, especially if you do any amount of shotgun shooting. I'm sure it works OK though. A MEC 600 JR will turn out an absolutely fantastic product and are easy to use. I load on a MEC 9000H hydraulic progressive reloader myself. I shoot a fair amount of trap, both registered and league and so does my wife, so I go through some bullets.

That thing is fast and like most all MEC's, does a heck of a job.
There are lots and lots of toys involved with this hobby naturally, but this will get you started. If you shoot much and stick with reloading, there will be more you'll want/need. A good case trimmer, powder measure. Better dies (like Bonanza Benchrest dies).
Oh yeah, Redding dies are pretty good. I'd recommend them over RCBS anytime.
Tim