May want to concider a 16ga or even a 20ga.My 15 year old daughter shoots a 20ga and handles it very well.If you are going to try deer hunting with it then definitly go with the 12ga.Just get a heavy one and it will reduce the felt recoil.
That I know of 000 buck is the largest size shot you can get.Not sure about the size but I believe it contains 9 pellets.More pellets as you go down.00 - 0 - #1 etc.This info is for 2 3/4 shotshells.You can look on any manufacturers(remington,winchester etc) website for specifics on size and number of shot.
Rock
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Walk softly,keep the wind in your face and watch your backtrail
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