Decide where you want to watch the shuttle launch. If you can get tickets, the best place is NASA Causeway. You can also watch at Titusville (try Spaceview Park) or at the Kennedy Space Center Visitors Complex. The Titusville site is best for seeing the shuttle launch, while the Kennedy Space Center Visitor's Complex is best for hearing the shuttle launch.
Purchase tickets for the NASA Causeway by going to the Kennedy Space Center website. They are available 6 to 8 weeks before the launch. You will need to move fast when they go on sale since they'll sell out within a few minutes. The tickets consist of package deals. Depending on the package you get, you can lunch with an astronaut and get admission to the Kennedy Space Center Visitors Complex.
Check for the scheduled launch date and time and continue to recheck. Due to weather or mechanical difficulties, launch times may be moved up or pushed back without much warning.