Just checking advertising news and new work, like most people do, is not enough. Understand product innovation and design. Look at companies such as Ideo. If you look into advertising to find other advertising ideas, you won't go far.
PEOPLE WILL ALWAYS RESPECT INTEGRITY
People are often scared of voicing their opinion in front of their superiors or telling their clients they are wrong. If you think someone is wrong, say it. But then you need to use the right words, which takes me to the next point.
BECOME A DIPLOMAT
Being talented but not diplomatic is going to slow your career. If you think something is shit and say it to someone, you will just hurt them. If you learn how to avoid arguments, people will always come to you for advice and help and your career will blossom.
LOVE YOUR JOB
If you are not 100 per cent sure you want to work in advertising, get out. Now. You won't last. On the other hand, if you are fascinated by advertising (in all its different forms), use every bit of your spare time to read creative reviews, constantly watch new work and read blogs, then you are almost guaranteed to succeed.
Most people are not able to judge the potential of an idea. They want to be reassured. You have more chance of selling an average idea if you are confident, than a brilliant idea if you are not.