Creating a TeamsID account let's you access TeamsID as an individual user. You can then setup teams and invite members. Each account comes with a personal safe which is not shared with anyone else.
Your first step in getting started with TeamsID is to create an account. Creating an account is free. Once you create the account, you can setup your account with teams and members. You can setup unlimited numbers of Teams and unlimited numbers of records. Pricing is based on members on the account. See pricing details here.
Each record can be made available to one or more members or teams. Each member can have access to one or more Teams. Here is an overview: