There should be someone who can help you at your current school (guidance-type office). Otherwise, get on-line and start looking for programs that offer what you want. For example, do you want a master’s in market, an MBA, or something else? Write or email and ask for information. No one can pick a school but you, because there are many factors (cost, location, type of program, whether they’ll accept you into the program, etc.) Also, find out if schools you are interested in require GRE or any other grad-level test. I don’t know what year you are currently, but even if you’re a senior, you should have enough time to pick and school and get accepted if you start now.