calm your breathing when you go to the ring and work out your plan BEFORE you leave for the fight. Whatever you do, DONT alter it until you have tried it out. Try to work out your oponent, i.e. trade a few strikes and see if it is likely he will look for a shoot on you. If it looks like hes a striker then get him to the ground as soon as, if it looks like hes a grappler then try and get a few solid shots in as early as possible. Once you get even the slightest advantage, dont give your opponent any time to recover. Get straight on him and look for a controlled finish
Best of luck mate, let us know how you get on..............