| As hackskii said Squats, Squats and Squats. Making sure your form is good try and go low if you can as you said you wanted bigger buttocks (?) but be carefull with you knees and lower back. You might need to work on your flexibility to help get your form right.
Calves can be a hard one to make grow for most my advice would be to really try and concentrate on the muscle contracting and steaching keeping the reps reasonably high 15-20 to really feel the burn and steach them out between sets. They are a stong muscle and can take a lot of weight eventually.
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You can't grow without pain!
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