You can sell your home without using a realtor in British Columbia, but if you do hire somebody to sell it for you, that person must be licensed under the Real Estate Services Act. The realtor is permitted to act for both the seller and the purchaser, but he or she must fully disclose to you the nature of the relationship to you and to the other party (if any).
Whether you decide to use a realtor or sell your property yourself, you should consult a lawyer before signing any contracts so that you fully understand the implications of what you are signing.
And you should have your home professionally appraised so that you know what it is worth in the current market. The appraisal will tell you what other comparable properties have sold for recently, and what the replacement value of your home would be. This gives you a good idea of what to list it for.