Dools17

Okay, so i first heard about day z about 3 months ago. And it sounded awesome! But i didnt have any money, recently i got some cash so today i decided to buy it. I downloaded the arma 2 and operation arrowhead. Then i downloaded the mod on Steam. And then I tried to play.... But the interface is very confusing and Im not sure how to play it. There are so many confusing things like missions and bandits or something, Im not quite sure im really overwhelmed. Can anyone explain to me step by step what to do? Like how to get to single player or a server that doesnt have all these complicated things? Thanks!