Here's a first-time setup checklist:

1. Go to Company → Company Info
2. Add your legal company name, address, and tax details
3. Go to Company → Branding & Documents to upload your logo and document branding
4. Go to Company → Payment Options to add bank details and payment instructions
5. Go to Company → Invoicing to set numbering, payment terms, and PDF defaults
6. Open My Account → Language and My Account → Preferences for your personal language and currency defaults

Next step: Create your first customer and send a test invoice!