If i complete battlepass than i buy it will i get the skins/items ? I like to buy battlepass but when i complete it will i get items or must be from tier 1?

Hey everyone, I'm pretty new to the game, I started about two weeks ago but I've been playing a lot and now I'm already level 24, meaning I can get started on ranked games whenever. However I've been holding back from it, partly because I w...