tire, pedals, crank?

thinking about building something up. not to to sure yet as i may be going on a trip to the otherside of the world soon. but otherwise, as the title says im looking for parts:
24" tire (prefferbly a hookworm or something like it.)
pedals (something grindable) (if grindable is a word)
cranks- ssqaure taper- *not needed but just seeing whats out there.

thats pree much all i need. if you have other parts lemme know too. nothing to expensive and nothing to fancy. thanks