Getting started .........
Best reloading manual out there to "teach" a beginner might be the Hornady manual. It has a huge section on what happens when a round is fired and carefully explains that whole process.
Also the Lyman Reloading manuals might be considered a "best buy" with the amount of data they contain.
I had been reloading for many, many many years before I found a book written by a fellow named Boyd Mace, "The Accurate Varmint Rifle."
This book tells the reloader how to fully and completely "condition" your brass to make really accurate handloads. Once the cases have been conditioned (you only have to do that once!), case stretching and periodic trimming along with chamfering is about all you'll have to worry about.
The biggest thing I strive for when reloading is "CONSISTENCY," which goes a long way to insuring ACCURACY.
RCBS equipment are probably the most popular in the US, although I prefer Redding myself. I'd stay away from Lee products as I think they're very cheap! (sorry if I offend many relaoders with that!).
Start with a single stage press like perhaps the RCBS Rockchucker, or Redding Boss presses, and the equipment found in their "starter kits." But before buying a "kit," study what each piece of equipment is used for before actually buying it!
As for the costs involved, buying primers or powder or bullets in bulk will yeild the most savings.
DON'T IGNORE RECOMMENDED STEPS OR TRY CUTTING CORNERS UNTIL YOU REALLY KNOW WHAT YOU'RE DOING!