How would it look like? Like, what would the puzzle's be?
Puzzles often involve standard language encoders (Braille, morse code and such are popular choices). May involve googling random things and requiring free-association skills, may involve small amounts of math (as those are the puzzlehunts I have background in).
Basically, easier versions of the MIT link titandrake gave you (because I'm writing it and I'm not a team of 20-200 people talented enough to win MIT mystery hunt).
Puzzles come in "stages", and the solutions to each stage typically form the basis of a "metapuzzle". For example the answers for the dominion-meta I experienced was "playing games" as a hint and
Angela Merkel (Chancellor)
Indiana Jones (Adventurer
Hermione Granger (Witch)
and several others as answers.