Tick anything you already have, in any order. Quests unlock once this is done.
Groups have kit standards and usually lend a starter outfit for your first events. Buying before you join almost always means buying the wrong thing.
Find a reenactment group2 things left above. Quests are real things you go and do, so they only make sense once you have what you need.
First one waiting: Choose a period and find a group