Thanks so much for reaching out!
I’d recommend starting off by taking a look at our Themer’s Guide, which can show you which templates can be edited and copied in order to achieve the results that you are looking for.
You can create a new folder here with those styles:
wp-content/themes/YOUR_THEME/tribe-events/tribe-events.css
Here is another article that you may find useful on this topic as well:
https://theeventscalendar.com/knowledgebase/changing-fonts-and-colours/
Let me know how that goes and if you have any other questions on this topic!
Thanks,
Jaime