How do u...???

ok so me and this guy have been talkin online for a while now i meet him at a dance but never got to ever talk to him i always talked to his friend instead. we are supposed to meet at this big rodeo thing coming up soon and i am gettin more and more nervious every day that gets closer. we have kinda made plans so that we can hang out and dance at a dance hall that they are goin to have and stuff. how do i talk to him w/ out sounding stupid? how do i calm down b4 this? what if he thinks im not sayin somthin right ? help me !!! what do i do?>