If you are doing map completion in WvW :
Take suplyes and build when needed.
Call out incoming , but say who and how many.
Don't expect comanders to take the keeps and towers you need.
Try to help out when you can. (taking camps and kill dollys)
Please understand that most of the players in WvW has a kind of server pride.
Understand the the things done in WvW helps you in you PvE progress.
Take in mind that colors in WvW changes , so if you need a spot in blue map wait untill we go blue (just check the day after reset , prefering in the morning)
And last but not least ... stick around ... you might like it
Edit: You might think that this don't belong here , and maybe you are right , but where else to put it to get the "PvE