You will need to convert all your data into fields to match appropriate tables/fields in the Zen Cart database infrastructure, and then import the data into your Zen Cart database.
The Zen Cart database schema is discussed at https://docs.zen-cart.com/dev/schema/
A few older (some of these may not be current) resources which may help you:
Migrating from another MySQL system
EasyPopulate-Free
EasyPopulate-Advanced
Using Excel to import or manipulate SQL data
Data Manager Tool
SQLYog Windows-based database mgr for MySQL