I would use the wizard templates. These allow you to create a page per step and navigation including validation and other magic between each step. Tab containers are not designed for this.
The YouTube videos Lauren refers to are outdated, about 3,5 yrs old, which is with the continuous improvement of the Mendix platform ancient history.
This module of the advanced page building learning path will help you to get started: https://learn.mendix.com/link/module/184/lecture/1431/4.1-Introduction
Additionally; you are also welcome in the community on slack; https://join.slack.com/t/mendixcommunity/shared_invite/zt-8g6ecnz8-v2YXGYjVn07Xw1RmXeKNIA