Possible duplicate, I just download a Android Studio Zip file like Eclipse, as I opened getting this error.
1.Click on Configure
2.Then Choose Project Defaults
3.Click on Project Structure
4.Set android sdk path
You will find here "C:\User\YourPcname\AppData\Local\SDK"
Note: Sometime AppData may hidden if it will not show then enable show hidden content.
5.Apply Changes
6.Then Select Sdk From Configure option
7.Then Android sdk manager page is open
8.In bottom you will see Install packages option
9.Install them and enjoy.