Luigi's Mansion will take about 6-7 hours (although it is a good game and you will enjoy it), might as well take care of that first.
Paper Mario: TTYD is a RPG (not a deep one since it was designed for even non-RPG fans to be able to enjoy it, but still a RPG), so that will take you awhile.
SSBM, do you mean literally just the single player mode and not multiplayer mode against CPU's? That could still take awhile as some of the Events are brutal (50 and 51 are a bitch to beat).
Really, almost all of those are good game (I hate Majora's Mask and will never get why anybody likes it), so it doesn't really matter which order you want to go in.