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?

Im still new to the game and am slightly unclear on this. I know you get a free agent at level 5 and 10 which i already did and then after that you have to complete agent contracts, but is there a limit to how many contracts you can have ac...