Welcome @milly
We have tutorials available that can get you started, please see →
This one seems to be the most similar to your experiment. →
If you are completely new to Galaxy, then starting with a tutorial or two to learn how to navigate the interface is a good idea!
- All introduction. → Introduction to Galaxy Analyses / Tutorial List
- Interpreting formats. → Hands-on: NGS data logistics / NGS data logistics / Introduction to Galaxy Analyses
- Basic manipulations and workflows. → Hands-on: Galaxy Basics for everyone / Galaxy Basics for everyone / Introduction to Galaxy Analyses
- Read QA and mapping short introductions. → Sequence analysis / Tutorial List
And finally, to load your reference data into Galaxy and prepare it for use with tools and workflows, please see this FAQ.
- FAQ: How to use Custom Reference Genomes?
- Example topic here with a custom-genome example → Getting NCBI Reference genome indexed for tools: custom genome, reference genome, reference annotation
Hope this helps and you can ask follow up questions!