Hello @TomK0663 and welcome! The best place to start would be in our Knowledge Base. They have an area full of QuickStart guides that is perfect for customers like you who are new to using us and covers a lot of different areas. Whether you're looking to start importing your contacts or creating a campaign to engage with your customers, we're here to help.
If you're new to online marketing, I would suggest checking out The Download. This guide covers many aspects of online marketing and is a great tool to have. There are even guides for specific industries.