Well done for making it to Grade 2!
You can find a handy tutorial for ATC here, made by one of our fellow community members:
With regards to piloting etiquette, there are no set rules, but you should be flying as if a moderator can see you, that is smoothly, safely, and showing regard to your fellow pilots.
These are the ways a pilot can receive violations, and you should always adhere to these rules:
If you have any more questions feel free to send me a message 
Regards,
2003iggy