You don't need any specific equipment.
You can stream easily from your PC's browser as well as the iOS and Android apps.
* Using Google Chrome or Firefox as your PC browser is recommended. Broadcasting from your smartphone's browser isn't possible.
* You will need to register for a pixiv Sketch account in order to use pixiv Sketch LIVE.
To learn about how to broadcast from the iOS or Android app, please see the following articles:
I want to stream with a camera
I want to stream a screen share 
・You can choose between three types of streaming: screen sharing, camera streaming, or streaming with the Draw feature.
・You can also stream with multiple people and set restrictions on your stream.
Important notes:
・If you want to stream age restricted content, you will need to set your stream as either [R-15] or [R-18].
・You will need to agree to the Terms and Guidelines before streaming.