To get started with DAM, first, you need to tackle the theory.
Audit your assets to determine what metadata you're currently tracking, how up-to-date is it, and what needs to be changed.
Following the analysis, create a new content taxonomy. Create rules for each asset upload. Naming conventions required metadata fields, etc.
Once you've created your content taxonomy, determine if your current software stack can help you implement these practices. Most of the time, without dedicated DAM software it can be challenging, so you might consider looking into that.
For more in-depth info, check out our dam best practices guide.