For your first question: Yes, many beauty stores sell professional makeup products. You can check out Sephora, for instance -they sell online too and have stores in US. For complete information on Sephora stores, check out this link: sephora.com/help/stores/index.jhtml Other online stores that sell makeup include many makeup brands' official websites and some other beauty stores.
Here is a list of some such sites you can buy professional makeup at: 1) sephora.com/ 2) ulta.com/ 3) buymebeauty.com/ 4) maccosmetics.com/ 5) drugstore.com/ 6) eyeslipsface.com/ 7) http://www.stilacosmetics.com/ As far as mineral makeup is concerned, it is meant for sensitive skin. It is also non-comedogenic (means it doesn't clog pores) and is very light to wear. So, in fact it is good for your skin's health.
Lastly you asked whether it is okay for a twelve-year old girl to wear makeup. It is advisable to stay away from makeup at this age since it can contribute towards various skin conditions including blackheads and whiteheads. Try to avoid makeup as much as possible and instead go for natural tints for lips and cheeks.
Use colored lip balm to stain your lips. Hope it helps! Resources: http://www.buzzle.com/articles/benefits-using-mineral-makeup.html.
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