Returning Player
Hey there, and welcome back.
1. Though there are few in game systems to learn about the game, there are plenty of external sources, particularly dulfy.net and the wiki. If you type /wiki in game at any time it will bring up the Guild Wars 2 wiki in a browser.
2. The best way to get money currently is meta events and farming dungeons/fractals. There is an overlay available to tell you when meta events pop up that can be found out http://gw2stuff.com
3. The way matchups are made for WvW have just changed so it’s too soon to tell. But it’s not like it was when you played.
4. Ele bunker builds are very powerful in WvW and do a lot of damage.
You have two question 4.s btw. lol
There’s plenty you should know but I don’t even know where to begin.
Vayne has answered your first three questions pretty well. As for ele’s in wvw bunker ele’s are good but don’t do huge damage. They are very viable though particularly for roaming and smaller scale stuff. Staff support undoubtedly offers more for large scale stuff but you aren’t useless if you don’t want to do that.
I yield to Kaiem’s expertise. I don’t play enough WvW to make definitive statements, though I do know ele bunkers are relatively hard to kill and they do make kills themselves.