halo tips please!!

The style of that game to become a professional is just don't be greedy and just wait the enemy to attack first just defense and if do not attack without a backup it is very important.

Play the campaign. Don't bother playing it on easy, you won't learn anything. Play it on at least Heroic, and if you find you can't handle heroic after a few hours of practice, then go down to normal - but you won't learn as much or get as good. Once you can play Heroic without dying too much, start training on Legendary. Just watch out for the jackal snipers ;) Playing online isn't the best way for a learner, since everybody else that's online has been there for a hell of a long time. Start with campaign, then start playing people - it'll help your aim, if nothing else. Also, final hint - turn the sensitivity up. Not right up, just above default to start with. You can't shoot somebody behind you if it takes 30 seconds to turn around.

I am sorry i cant't help you, i have never palyed halo...