Step 5 - Go Diving!
  At this point you probably have a good idea of whether or not SCUBA is something you enjoy.

If you're hungry for more you'll want to schedule additional dives locally and/or someplace more exotic.

If you've really caught the diving bug you'll also want to sign up for more advanced or specialty courses and consider purchasing some of your own equipment. Owning your own equipment means increased familiarity with it's operation and maintenance records which translates into peace of mind.

Many places that offer basic SCUBA certification classes also offer advanced courses and arrange dive trips.  Going with a group is a great way to enjoy a dive trip since you'll have lots of (soon to be) familiar faces to ask questions and share stories.