Licensure for Certified Public Accountants in the US is handled by 55 distinct state and territorial jurisdictions (connected through the National Association of State Boards of Accountancy (NASBA) as a central scoring and information clearinghouse) in which CPA exams are given, using content generated by the AICPA. The best single resource for learning about the exams -- what's involved, when tests are given, how and where to apply, how licensure works, etc. -- is NASBA's Candidate Bulletin. Before you do anything else, get as familiar as possible with it, and then select the jurisdiction in which you mean to be licensed.
Students at USI typically come from the tri-state area around Evansville, IN -- Indiana, Illinois, and Kentucky. For that reason, we've provided CPA exam and licensure information here for those three states. NASBA provides access to all exam and licensure jurisdictions, so interested users should check the NASBA site for information about licensure outside of this region.