Moin!
How Sey said, you can decide how to play wow.
It 2 PRINCIPLE realm (server) types
PVP = Each faction (there are 2 in the game) has afflicted certain areas in which you are sure all other areas there are neutral and thus combat zone.
On pvp realms you always have the problem that one has fear in the neck. It can happen easily that you're running area with level 25 neutral by one and then a player of the opposing his lvl 70 faction one slaughters;)
PVE = Each area except for opposing hometown is neutral, and this time no combat zone.
One needs to change only in the PVP mode with his character before we can be attacked by enemy players. then one can focus on it's quests (tasks) to complete and killn monster;)
that's for the principle should know what you ... as a beginner I recommend at least every once bought a PVE realm to learn the game ...
Now leveling the ...
Shortly after I made my first char to lvl 70 has laboriously, Blizzard introduced a patch that speeds up the aufleveln between lvl 20 and 60 ... ie, it increases more rapidly between 20 and 60, which reduced the playing time a bit ...
Tjoa ... what remains to be said?
I fall more of a non-grad