Get out of town
Your first instinct when the news of a zombie uprising breaks will be to get the hell out of town – after all, the countryside is less populated than big cities and will be easier for survival. This is fine, but if you're in a big city it creates a problem: with everyone rushing to escape at the same time, it will cause a deadlock – only this time with more emphasis on "dead". Plan your route out of the city in advance to avoid traffic.
Search for survivors
Safety in numbers: when you can, make sure you are part of a group or let other people know you're still alive – if you remain on your own you will, eventually, go mad. Be careful about using big signals though – you may attract unwanted attention.
and always keep calm and don't panic!