First, why do you want to go to graduate school? If it's to avoid employment or to delay paying off your student loans, your reasoning is faulty. If your answer, "Because I'm passionate about learning and I want to both broaden my mind and further my career" then you are ready.
Also consider Peterson's "A Guide for Potential Grad Students: Should You Go To Graduate School?"
Items To Consider
Questions to Ask
Additional Items to Think About