3. Spending gold on resurrection or repairs are fine. Is it possible to resurrect at graveyard (if so, what penalties are forced onto me) or I'm forced to pay gold everytime I want to resurrect? When I die, my equipment is never lost or stolen by enemy players and my level progress is not changed at all (like those do in Tibia).
5. If the system messes up, Am I forced to buy another copy of GW2 or just create new character or so?
2. The max stat armor/weapons are pretty low compared to other games. You should be able to keep your armor updated mostly through drops.
3.You have to pay to be resurrected at a way-point if no one else res's you, though I believe cost is waived if you're out of money (should never be a problem). The cost for way-pointing is pretty low though so its not a big deal. Due to an update, you no longer need to pay for armor repairs.
Other players cannot loot you and you do not lose anything.
5. GW2 currently uses mega-servers, which groups players on a given map based on similarities. Parties can usually be grouped on the same map by joining a party and then porting in/out of a map until you're together. You will have to choose a home server, but that mostly only affects your WvW team.