Just send /start Command or ask greetings message. It will be automatically started.
Answer is Yes, You can add this bot to your group for fun with Simple Admin rights.
Answer is No, it is not important to run this bot on channels, it is pointless.
If you are at telegram then you can go to issue Button for Submit problems or Go to Review Button for add feedbacks & rate the Bot, Else on the Telegramic website it's very Easy.