Not sure where to see them, like you I saw some of them - as with Rebels.@decafjava I've only seen parts of the Clone Wars, as my boys weren't that in to Star Wars when it was on. But I liked what I saw. I wish they'd show them again somewhere, in order. I didn't know they were canon.
Yes they are canon - I understand the official list now includes: the 6 films, the Clone Wars and Rebels cartoon series, and some official novels and comics published by Disney for example a few that tie in with the sequel trilogy. The EU was for better or for worse thrown out when Lucasarts sold out to Disney. That said many elements of the EU seem to be making their way into the canon, like the recent introduction of Thrawn.