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Make sure that you're holding the recorder correctly. Practice the right blowing technique. Learn the correct tonguing technique. Take good care of your recorder.
Place the recorder between your lips and balance it lightly between your thumbs and fingers.  Your left hand should be at the end nearest the mouthpiece and your right hand should be at the other end. Don't bite down on the mouthpiece or allow it to touch your teeth. How strongly or softly you blow into the recorder will affect the type of sound your produce.  If you blow too hard, the recorder will produce an unpleasant, high-pitched sound, so you should try to avoid this. Instead, try to blow softly - as if you were blowing bubbles. This will produce a more musical sound. Breathe from your diaphragm to produce a steady, even stream of air. This will help you to hold your notes for longer. Sitting up straight, with your shoulders back will help you to maintain good posture while you play. When you play a note on the recorder, you should imagine saying the word "doot" or "dud" as you blow.  This causes your tongue to move to the roof of your mouth. This technique is known as "tonguing" and provides a clear start and finish to each note. Be careful not to actually say the words as you play, you should only use them as a guideline to help you learn the tonguing technique. Taking good care of your recorder will keep it in tip-top playing condition.  Wash your recorder with a little warm soapy water, and scrub the mouthpiece with an old toothbrush. Leave the recorder to dry thoroughly before playing again. Keep your recorder in a case when you're not playing, to protect it from chipping or other damage. Don't leave it somewhere it'll be exposed to very warm or very cold temperatures, like in a warm car or beside the radiator.