Here's a first-time setup checklist. Everything lives under Settings ("Instellingen"):

1. Go to Settings → "Bedrijfsgegevens" (business details) and add your legal company name, address, KVK number, and VAT number
2. Go to Settings → "Logo en kleur" (logo and colour) to upload your logo and pick your brand colour
3. Go to Settings → "Betalen" (getting paid) to add your IBAN; filling it in puts bank transfer details on your invoices automatically
4. Go to Settings → "Facturen en offertes" (invoices and quotes) to set your payment term, automatic reminders, and how long quotes stay valid
5. Go to Settings → "Weergave" (display) for your personal theme, text size, and app language

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