Most of what you're looking for is already available on the forums if you search for it.
Since there's too many requests, this is all I'll leave you with:
Code:
/run https://www.youtube.com/watch?v=jnLGWph0VZ0
to open a link in your default browser. Make the script safe to run before putting it on your bot though, otherwise you can make other users have access to your run command.

Nillens @ irc.twitch.tv
Nillen @ irc.rizon.net