I started reloading a couple of years ago with the help of this forum. My motivation was my new 44 mag revolver. After a couple of trips to the range where I spent in excess of $100 per trip on factory ammo, I realized I needed to reload, go broke, or quit shooting.
454 casull falls into that same "expensive factory ammo" category. I started with ABC's of reloading and then bought the RCBS supreme master reloading kit.
http://www.cabelas.com/spodw-1/0018937.shtml
It had almost everything I needed except dies, and a set of calipers. Be sure to get a carbide sizing die so you won't have to lube.
IMO straight walled pistol reloading is as simple and basic as it comes. I spend a lot more time effort and money developing rifle loads but I tend to get a little obsessive about my rifle cartridges.
You will certainly have some questions along the way, but I encourage you to jump right on in!
Be safe, start slow, and be sure and let us know when you squeeze off that first handload.