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Girls can wear a training bra/crop top type bra when the nipples start to protrude. These bras are a lot more comfortable, and they almost look like crop tops, so you might feel less embarrassed because they won't be as obvious.  You want to find a very comfortable bra for your first one. There’s no reason for a young girl to have a fancy or lacy bra.  Training bras are usually simple, stretchy cotton bras without cups.  A sports bra is another good idea for gym class or if you are in any team sport.  Because sports bras are designed to be flatter in the cup area, and are very comfortable, they can be good choices for your first bra, even if you don’t play sports. If you have grown breast tissue beyond the buds, and if you measure an A cup or more, it’s time for a soft cup bra.  Measure yourself or ask your mother to measure you every four weeks so you can figure out when you need a soft cup bra. These don’t push up or otherwise change the shape of the breasts, so they are appropriate for young girls and are also comfortable. Underwire bras are also not a wise choice for a first bra; they provide more support for girls with very large breasts, and since you're just starting to develop, that's probably not needed. You can choose a bra that’s similar to your skin tone so that it doesn’t show through your shirt, if you want. Buying bras in different colors can help you match them to the shirt, so they don't show through (for example, you wouldn't want to wear a black bra with a white shirt unless you have darker skin). A girl may need to learn things older women take for granted.  For example, a girl might need to know that you don't need to wear a bra at night. Some bras have padding, but others don't, and the padding is not necessary when a girl is just starting to develop.  You can use a wash bag to protect the bra from damage during a washing cycle. You can find first bra lines in many department stores and in many lingerie lines. This can be a good choice for a girl's first bra.
Try a training bra for your very first bra. Choose a bra with a soft cup if you've developed further. Learn about the ins and outs of using a bra.