First- decide on what kind of contest you want to have.
Second- Come up with the prizes and rules. A 3 day blast is usually a good prize. Then come up with the dates how long you want to run the contest
Third- Post a Bulletin and a blog with the information of the contest whats it for and the prizes
Fourth- Create a Prvt folder for the ripped pics for the contest. And keep it prvt till it opens
Five- then before the contest opens send all the contestants an email with there link letting them know the time its going to open and close. When it does opens just set the folder so everyone can see it and vote
Finally- when the contest ends close the folder my making it so you can only see it. Then within 24 hours of the close of the contest send out the prizes.
Thats it so I hope this helps
any question let me know