Well, of course the first step is to find other Canadians who want to receive it! (Chuckle.)
Other than that, feel free to copy anything you like from the US and EU versions.
When I started the US version, I chose an appropriate box from among the many small ones I had sitting at home from buying stuff online, and put in about twenty things. Two other people generously donated some extra stuff to go in, so I included their seeds, too. Ever since then, I’ve just followed the rules on the first post. (With occasional tweaks to the rules, such as making sure to clarify that it was US only, and adding a rule that the box should be sent on within two weeks of receiving it.)
Maintenance is pretty simple – usually I just add people to the bottom of list, remove people who have already received it from the top of the list, and answer questions. Occasionally a situation arises where I need to get in contact with someone who’s held on to the box too long, and that requires a bit of gentleness and tact. But that only comes up every so often.
If you want to start one in Canada, you will be welcome to use any or all of my ideas, or organize things totally differently. You can use the same name, like the EU version did, or choose your own name. Whatever you prefer! If you start it, you can structure things in any way that makes sense. 