Galvatron: The CMPs are pretty open ended and can be played in any order. For the Land of Promise adventures, CMP 2012-05 Hopping the Fence acts as something of an introduction, so if possible play that first, but it's not necessary to do so. The London Calling series is pretty much completely open.
Shed: CMPs are Season Neutral. So long as you don't move into the Season 4 adventures, you're fine.
Bull