The servers don't matter much, we all play on two "megaservers" - one for NA, one for EU. The only thing were it is relevant right now is the "PvP environment" World vs.. World vs. World (WvW for short), and even that will change. + you can switch your homeworld later on. Gw2 basically has two regions: NA and EU.
Pick a spec or ability set and unlock it completely (unless locked due to level restrictions). It is possible to stay on core specs and not use elite specs, but usually elite specs are more powerful. You can adjust your build any time outside of combat, so you can experiment a lot if you like to. This ^^. #9.
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