Here are some answers to your questions:
1) I go to school everyday.. and my parents go to work everyday... ?will that be too much for the
[COLOR=green !important][COLOR=green !important]dog[/COLOR][/COLOR] to handle?
Every dog is different. It shouldn't be too much for the dog to handle, but you have to exercise the dog every day. Take her for a walk and make sure you play with her.
2) second question....... the Yorkie is 3 years old and is a girl... my mom said that she'll have her period... is that true..?
Yes, she will get her period. It's best to spay her as soon as possible. Then she won't get her period. Plus it calms them down.
3) 3rd question... How big do they get?
It depends on the dog. Our last Yorkie was 14 pounds. Our current one is 10 pounds. They are normally small.
4th................ are they calm, or very hyper.
They are normally hyper, but with exercise they calm down.
5th............... do they cry alot?
No but they are barkers.