It depends on your region and, even more specifically, the school and district that you're teaching in. Generally, you'll teach throughout the day while having someone observe your teaching possibly once or twice a week. After the observation, you'll probably meet with your Instructional Coach, Administrator, or Teach For America representative to discuss your teaching and plan ways to improve.
I glossed over what I mean by "you'll teach throughout the day", just be prepared for using a lot of emotional and mental energy as you and the students learn. It can be great though!