Build A Membership Website For Me

The project is to build a WordPress based membership website for me. Only members will be able to access the complete website. We have three payment plans, however the plans and membership levels are based on duration of membership, so settings required are quite less. We have 10-12 different product categories, all are available to all members, some are paid and some are free. The products are digital in nature so should have option to download the products. The structure of website is very important.