Go to the revenue canada website and there is a booklet about the things that you can claim. Keep all receipts for everything throughout the year and then at the end of the year you can sort out which ones you can claim and which ones you can't. If this is your first year there will be a lot of startup costs for you such as equipment meaning for at least this year there is a very good chance you won't owe anything in taxes or at least very little other than your contribution to canada pension.