mindset when rushing

I am attending UA in the fall and plan on rushing in a fraternity but my family is not very wealthy. Which ever fraternity I recieve a bid from will be paid for by a distant relative who was an active member of a fraternity when he attened UA. Over the last two years of high school I have come out of a shell and risen in the ranks a bit socially. I am really good with new people and fit in well with large egos without having one myself. I am looking for a frat where I can be a function member that serves a purpose in the brotherhood as a whole and not just be another insignificant frat guys. What should someone set as goals during rush week and what mindset will help you out the most when meeting people who are obviously more financially well off?