Starting your own tournament

I'm a highschool teacher and was thinking it would be great to start a chess tournament for the students. They don't want to give up their time at lunch but thought an online tourney would be the way to go. Anyone have any ideas of a way I could make a tournament open only to my school (for now), have students register, and play. Same idea as our tournaments... one move every 3 days or so...

Thought....?