You'd be booking through airmiles, and they'd be separate. So log into airmiles and choose travel then US Parks. It will bring you to the airmiles redtag site. You will have to click on US Parks at that point, it defaults to vacation packages for some reason. There you can pick the park (WDW, Universal,
Disneyland) and the number of adult or kid tickets and the start date for the tickets. Click search and it brings you to the options. There you can decide on the ticket you want, 3 day, 4 day, park hopper, etc.
For the hotel, on the airmiles site you'd choose travel and hotel, then you can search by where you are travelling to and the dates you want. You will have the list of hotels available but can look at it as a map if you prefer. Once you click on a hotel it will bring you to the room options, pay attention to the "non refundable" that may be listed, in case you are looking for something more flexible. You can see the airmile or dollar cost, and if you are onyx you can also pay half airmiles, half cash. If you pay with all cash you will earn AM and it'll show you there how many you will earn.
Hope that helps! Don't go through redtag directly, you have to get there through the airmiles site.
https://vacations.airmiles.ca/ that link might work? I was able to see tickets for March break, but I didn't go further into the year, so if you are looking at like 2024, maybe they aren't there yet? If it's 2023, I do get available tickets for WDW popping up.