IMO it is much harder to pull off an early blitz, because 1) the map is much bigger -> longer ways and 2) starting militaries are smaller. So best advice would be to wait a few turns and build basics and recruit some troops, then assemble one or two forces and go after your rebel neighbours. In general, the pace of the game seems much slower. This is something I like and value very much with e.g. EB, but I still have to get used to it in M2TW.