If you're a new player and you're reading this, you're doing well.
You're checking out forums for advice and any other information that can help guide your way through the immense adventure you're about to undertake. Encourage your friends and guild mates to do the same.
Don't be afraid to ask questions in raids, or to state you don't understand how a strategy is to work. We've all done all quests, and raids such as HoX for the first time, don't be afraid, it's beneficial to the party to help you as this helps the team and can be detrimental to not understand what's happening.
Have fun storming the castle.