Mosqwik

I am considering starting Wow but i have some questions to ask and i trut your judgement/guidance.

1)I dont really understand...
Do you pick a realm then make characters in that realm then decide on them if you are going to be pvp or pve or whatever else you cant be?? or do choose a realm then a playing thing (I mean pve or pvp) then all the characters you make have to play in there???
2) is it horde or alliance all the time??
I mean do you pick one then you are stuff in that group forever or can you make different characters in each ?
3) is it really worth the money ?
for me its like ?8 a month $15 atm i think cos of exchange rate. As well as the ?20 to actually buy it.
thanks

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