Short answer
Publish an owned catalog first, give buyers and reps one link, capture RFQs and quote requests, then connect your payment gateway. Marketplaces can still help with discovery, but your owned catalog becomes the source of truth.
Direct B2B selling checklist
- Use your own domain and branded catalog.
- Capture buyer questions, RFQs and repeat order intent.
- Connect your own gateway and keep revenue control.
- Sync selected products to eBay, Amazon or other channels when useful.