Look into an RCBS Starter Kit. It'll give you everything you need less the dies and shell holder. You'll need a die set and a shellholder for each cartridge. Cartridges with the same case head(like the .308, .30-06, .243, etc) use the same shellholder. Your's are all different. Start with the cartridge you shoot most and buy the dies and shellholder for the other two later.
It comes with a Speer loading manual, but buy another one anyway. The Lyman book gives you more loads for more bullets weights than the Speer book. Not that there's anything wrong with it. It's just that it only gives you loads for Speer bullets.
Then:
Beginning with the starting load, load 5 rounds only. Go up by half a grain of powder, loading 5 of each keeping them separate until you get to the max load in your manual.
Then go shooting. Shoot at 100 yards, for group only, slowly and deliberately off a bench.
Change targets between strings of 5 and allow time for the barrel to cool.
For your .308, when you find the best group, sight in 4" high at 100. That'll put you on target out to about 300 yards with no hold over.
And don't forget that we're here to help you. Feel free to ask any questions you may have.