Open office plans may not work well for all. It often leads to distraction, but here is a bit of advice from Basecamp (they use open office plan):
Embrace Library Rules.
Library Rules means keeping to yourself, keeping your voice down in hushed tones, not distracting one another. If you do need to talk to someone at normal volumes, grab a room. A key to making open floor plans work is also having private rooms scattered throughout the space.
No hard surfaces (creates ‘echo factory’). Use acoustic materials.