So you've finally decided to join the real world and open up your first credit card. Congratulations! No, seriously, you're making an excellent decision. While you may be disappointed that the simplicity of life without any bills is over, you'll be patting yourself on the back in a few years when you realize the good credit score you've built up has given you greater financial flexibility to make major life purchases. That is, if you use your credit wisely. Credit cards can be a responsible user's best friend, but a living nightmare for those who are careless with their spending habits. So how can you make sure your credit card is a positive force in your life? Here are seven great tips on getting your first credit card and starting your credit off right.