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The first thing to get is a good reloading manual or two. Look for used ones on ebay or advertise on this forum. You can't go without it. Lyman's Reloading Handbook is good, and for reloading data try to get Ken Water's Pet Loads. Hornady and Speer have good manuals as well.
I agree with Johan22. Do LOTS of reading and research first, only then think about buying gear and components.
I am more into loading pistol and rifle than shotshell, so cannot be of much use there.
Good luck.