You can add your products to the CRM using the Opportunity Lines, so you can then select which products you have quoted on when creating an Opportunity. OpportunityLines is a Custom Dropdown List and you can edit the list to add your products.
In Settings, System Settings go to Custom Dropdown Lists then OpportunityLine.
You can delete the products that you don’t want, and to add the ones you do.
Read more about custom fields and dropdown lists in this article: How to create and manage custom dropdown lists?