When you get to YYZ T3, you'll need to do the following:

1. Since you printed your boarding pass, you can go straight to the DL check-in counter. Show the agent your boarding pass, and they will weigh your bags, tag them, and give you the white customs form you need to fill out.

2. You'll take your bag(s) and customs form over to customs & immigration(C&I), and go through the process there.

3. After C&I, there will be a conveyor belt for you to drop your bag. Drop it.

4. Go through the metal detector.

5. Go to the DL gate. If memory serves, you'll need to take a shuttle bus inside security to get to the DL gates; it's all well-marked.

Good luck!