Before you start playing your trumpet, it is important that you warm up properly. This means your lungs, lips, tongue and fingers should all be exercised and ready to go. Starting with your breathing, it is important to make sure that you are using your diaphragm and not your chest. An exercise that can help you do this is to sit in a chair, let your hands fall by your sides and lean over so that your chest comes into contact with your knees. Breathe calmly, taking care not to raise your back when you breathe in. This should make your stomach expand, which means that you are breathing correctly by using your diaphragm. Doing this will give you more control over your trumpet playing, which goes a long way to making a solid, sustained sound.
Another idea that can help you with the sustained amounts of breath needed when playing the trumpet, is something that you can also do at home, after playing on the partycasino.com site or chatting on the phone to friends. Basically, try to hold a piece of paper against the wall using just your breath. This will give you practice with creating a sustained amount of breath, as well as strengthening your lungs.
The best way to warm up your mouth so that you are ready to start playing the instrument is through buzzing exercises. Keep the corners of your mouth in and tight as you buzz though them. Buzz first without the mouthpiece, then take just the mouthpiece and buzz through it. This will help your muscles get used to the position they must be in when playing, and will warm up your facial muscles sufficiently for you to then start playing. As long as you warm up properly, you should enjoy playing your instrument, so get started and have fun.