For your itinerary, it depends on how long you are wanting to be in Canada. For example, if you are seeking entry for a few months I would try to make an itinerary that has maybe 2 events per week, like "Visiting grandma Dora in Calgary" or "Weekend trip to Niagara Falls".. things like that.
If you are coming for less than a month, I would say try to make it as detailed as possible, as in write something for everyday that you are here, even if it's just "Spending time with family at home".
When we applied for ours, we asked for the whole 6 months. We had about 30 items on our itinerary of things we wanted to do or see.
I hope this helps! Good luck!