You can try and search Google with keywords. For example: nonprofit addiction etobicoke
Charity Village has nonprofit / charity listings. Reminder that not all nonprofits are charities and this is not very comprehensive.
Canada Revenue Agency has a Charity Listings page where you can search for a charity or nonprofit by name.
Ontario Ministry of Children and Youth Services has a list of agencies for child and youth mental health.
211 Central is a federal government funded website that has many listings for community agencies in Toronto, York, Durham, and Peel Regions..
You can find more about the community your nonprofit serves by looking at:
Here are some databases with full text access to newspaper, magazine and journal articles:
To search these databases identify the key concepts related to your topic and combine search terms using AND and OR.
CAMH OR "Centre for Addiction and Mental Health"
"Better Behaviours Service"
CAMH AND programs
Depending on your nonprofit's focus, you may find more indepth information and reports at these various websites:
These are just a few of the insititutes and think tanks that may be applicable. Here is a more comprehensive list put together by University of Alberta Libraries.