When importing goods into Canada, there are two ways to clear Canadian Customs.
1) Through a customs broker.
You can hire a customs broker to import your shipment and they will base their rates on how many items, how many different tariffs (different types of products) and usually charge you a fixed rate per shipment.
2) Clear customs yourself.
Step 1: Read this before starting.
Step 2: You will need to search your tariff codes in the CBSA Customs Tariff directory. Here you will find 99 chapters of custom tariffs each with a specific category. In this document you will also find Country codes for the country you are importing from.
Step 3: You need to learn how to fill out Form B3, Canada Customs Coding Form. This will take a while and seems difficult at first, read the manual for this form and follow instructions. For manual on Importing Commercial Goods Into Canada, click here.
Tips: Canada Customs Border Crossing Agents appreciate well organized customers. The first time you import they will help you with some of the logistics however, if they are busy or you seem unprepared they would prefer you used a broker.