RCBS,Lyman,Pacific, Lee dies have the same thread....7/8x14 and will work in most presses.
CARBIDE dies are the way to go...just make sure you keep them clean.
Get a good Tumbler first...some good media...I use Lyman corn cob....walnut media has a dye which will eventually become dust and make your cases a mess.
If you use a polish, make sure it does not contain ammonia...it will weaken the brass over a period of time.
As mentioned before, get a good manual and read it through & through...it is a science and an art...very well stated!
Start with one caliber and become proficient reloading that before you venture off to others...you do not want to confuse any of the data.
Get a notebook to keep track of your loads...caliber, brass mfg,.times the case has been loaded, powder (IMR4895, Bullseye,231 etc.) grains, primer type & mfg. bullet mfg. weight, style & mfg. of bullet...ie: 158gr. LSWC, brand X 200gr. JHP etc.OAL and any other info. you can refer back to at a later date...also how the loads shot..accurate, not so accurate...junk and what gun you tested them in...things change with different components & what they are shot from.
Good luck