You should buy a reloading manual and read up on reloading. The powder to use differs with the caliber and bullet weight you are going to reload. Buy a Nosler reloading manual. The Nosler manual calls out the most accurate powder tested for the various calibers and bullet weights. I've come up with some good loads using the Nosler most accurate powder tested. It isn't allways the best in my guns because different guns like different powders and bullet weights but it's a good starting point.

Decide on the kind of press you want and buy that press with the reloading kit, this will get you most of the equipment you will need. You will need to buy a set of Calipers, a powder trickler and a brass trimmer.Any of the major manufactureres make good stuff. I bought RCBS and I'm very happy with the equipment.