What all do I need to do? Also how do you get your chicken fat? I know thats a weird question but my chickens never seem to gain a ton of weight. Some of them do and some don't. Any special feed?

Are you doing it for 4-H? Before the show wash them. They can get chilled, so do it when it's warm.
Make sure they don't have parasites, that is a disqualification. Make sure you know what breed your chicken is, what the characteristics of that breed are, and make sure the chicken doesn't have any traits that are considered "defects" for that breed.

You fatten a chicken by feeding them. Always keep food in front of them. Especially if you are raising a "meat" chicken. Some breeds of chicken don't get very fat. And Bantams, which are miniature versions of chickens, are very small.

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There really isn't any special feed, but "grower" food and "layer" food will make a chicken grow faster, and fatter than all purpose food. Layer food won't hurt roosters.
There are protein supplements and steroids, but they are serious disqualifications.
Just like an athlete on steroids.

The trophy in my room that says Champion Hen. And my brother and cousins have won numerous chicken trophies. Yes, we are chicken people.

1. bathe the bird
2. set the bird in a warm dry area
3. once dry, put glycerin/ mineral oil on comb,legs, wattles, and feet
4. clip nails and beak

my leaders, the judge i just went to listen to

Brush her teeth...er, beak; clean her comb, polish her toenails. Feed her cracked corn and chicken feed....lots of it with plenty of water. Good luck!