Elementalist WvW build
Since your new to the class, i give you the safiest build, which still provide very good support, out there:
http://gw2skills.net/editor/?fFAQFAWhMMqc25wlBr0ANACxhFFOJQ5uNnC-TxhFABAchAY4BAc0+DUp87OdA8pEUS1fAA-e
If you want something more bursty, you can take out 10from arcana and put them into air to take either lightning rod either tempest defense (it’s up to you, rod is “garanted dps” while tempest rely on CC from other class)
If you want be more support, put the 10from arcana in water and take cleansing water (#5 water become the ultimate cleansing machine)
For a more DPS stuff, you can go for some berserker-knight-valk mix. I’m pretty sure many player will come here with a few pre-made mix so i invite you to follow them ^^
DPS rune: strengh (obvious, but pretty expensive too ^^)
…
It does the job well :-)