Hello, I'm a day trader, self-employed. How should I report my income (loss) and my expenses?

Should the income (loss) flow in form T5008 and the expenses in the self-employment section ? If so, is the type of income called ''Investment'' in the T5008 for day trading (business income)? And what would be the category of business for the self-employed section? I tried adding the loss I incurred in the self-employed section but negative numbers are not allowed. So i figured that I wasn't reporting it at the right place.... If the expenses aren't suppose to be disclosed in the self-employment section, where should they go?