What are some good stand up jokes?

im 24 years old and am performing at "improve at the 2nd city" (its like the biggest and hottest comedy club in Chicago, chris farley performed there before he was famouse.) anyway i have some material already but need more. i heard a producer from SNL will be their and i neeed to good. some backround info about me is im mexican so if you know any ratial jokes and im overweight so im willing to make fun of myself their. or anything going on in the media that i can put in. please no corny elementary school jokes remember im preforming at the biggest comedy club in Chicago.