I'd recommend that you start by buying at least two of the biggest, bestest, baddest reloading manuals (2015/16 Editions) you can find and read the first couple of chapters in each. They have pretty exhaustive lists of all the goodies you need. Buy one from a bullet maker and one from an equipment maker and cross-reference their list of essentials that they call out. Everything that hits your list twice is worth making note of and acquiring "along the way."