Before you can take the steps necessary to have a successful career you have to figure out your own personal definition of what that means. Keep in mind this is your definition so get those other voices out of your head. You know which ones I'm talking about. They are the ones that say you haven't truly made it if you aren't taking home a six-figure paycheck and spending your day in a corner office. If you are satisfied with your cubicle and making enough money to pay your rent, that's fine. If not, that's okay too. Don't apologize for wanting more or less than someone else.
Only when you figure out what success means to you, can you begin to set about achieving it. Should your definition change at some point, then you will adapt your plan to fit your new goal. Read Planning for Career Success: 11 Tips for a Fruitful and Satisfying Career