When I started my business, I faced a similar situation with setting up the chart of accounts. It's common to encounter fields for linked accounts that may not be relevant to your operations. Generally, you can leave those fields blank if you won't be using accounts like AP, AR, freight receipts, or sales tax payable. However, this may limit your ability to create customer invoices or vendor purchases within the platform.
Additionally, as your business grows, integrating various tools can be crucial. I found the article https://ventor.tech/warehouse-management/how-to-connect-a-barcode-scanner-with-odoo/ extremely helpful. Even if you’re not dealing with inventory now, this guide provides insight into enhancing operational efficiency and could be valuable as your business evolves.