You can get yourself registered through a website, but it takes some expert advice and help to figure out the best way for your business.
Depending on what your company is licensed to do, you might have to register with customs to get your business going. This is especially true if your company deals with importing or exporting, mostly because customs has pretty tough rules about things you can't bring in or are limited. After you're registered, customs will give your company a special code for importing or exporting, and you'll need to use it every time you do business.
