Step 1: First of all you will have to download and install the Android Software Development kit from here on your computer, preferably on the desktop so that you can easily locate the same.
Step 2: As you have downloaded and installed the SDK in the last step in the computer, you will now have to browse for the SDK folder and launch SDK Manager. Please note that here that if you are launching this for the first time then you will see a window wherein you will be asked to choose for the packages as shown in the below screen shot. Also, you can check as well as un check any of the package just by clicking on the name after which you just need to select the Accept/Reject the radio button.















