Start by going to the tournament of legendary legends, and setting the difficulty to easy. The run starts when you start the tournament Each character has it's own category and moveset, so this is just an overview.
Most characters can d-air cancel to another d-air in this game, (i.e. Master Croc, Rhino, Shen), which is where you down air, land, and down air again. This renders the opponent useless.
The levels in the run are pretty self explanatory, but ill go over it. Most levels are stock based levels, which some include teammates. There is also king of the hill, where you have to hold a crown for the longest time, dumpling battle, where you have to hit your enemy to pick up dumplings.
This run is pretty simple, besides that, Have fun running!