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Start with a good reloading book. Read the section on the type of reloading you're going to do (shot shell, rifle or handgun) several times before you even start looking for equipment.
Some of the starter kits (Lee for example) come with the book and are not a bad way to start either.
If possible, get someone who already is reloading to show you the ropes as well.
YouTube has lots of videos on it as well - Ammosmith is one channel I watch.
Grab a few loading manuals and learn up on the hobby. Once done, start buying the things you need to reload (press, dies, etc) and work on up from there!
Good books will help you save money as you will know your needs!