When you come to Jesus, you have to ask yourself "Am I willing to make this public? Do I want to identify with Jesus in his death, burial and resurrection? Do I want to be fully obedient to his every command?" If the answer is yes, the baptism is your next step.
Check out our page on Baptism on the Green which will be held on July 13. There is a link to a sermon there that gives all the speicifics of what baptism is and who it is for. You don't need to be a member. You don't need to be super righteous. You just need to be willingly profess that you follow Jesus!