You can evolve, modify, grow, develop your business as you go. Go to Revenue Canada - pick up various publications on eligible business expenses. You may want to register with the Province for PST purposes and with Revenue Canada for GST purposes. Find out about their rules and how they would apply to you - there may be some benefits waiting for you. For example, you need to decide if incorporation makes sense for you and how you should structure and organize your business.
Many communities have business centers which help companies get launched.
There is also a great amount of information available on the worldwide web for the budding entrepreneur. It's a good idea to align yourself with an accounting firm early on.