1) I think all player characters start as "adolescents" of their respective races. I do not remember any exact numbers as they are not documented anywhere(I think). There was a forum discussion about it once if I remember correctly.
2) There is atleast one known other continent in the lore and some off shore areas have been added to the game. So to answer question two, your character can have a background from somewhere else than Forostar(the name of the northern land, the continent which is the game area). A quick read through the web site world files will give you some basic information.
It would be best not to get too thoroughly imaginative with any off continent stories though, unless you are prepared to be branded as a liar or a lunatic
Can get messy.
3)Godly questions are best solved IC, as it can be much, much more fun and involved to talk with a priest and give a priest character a chance to influence your character's immortal soul
A quick rundown of the gods
Taniel, law and order, good
Evren, life and creation, good
Gwen, love and passion, nice
Zhakrin, balance, neutral
Asral, war and death in battle, slightly nasty but mostly neutral
Lilith, chaos and darkness, evil
Sathonys, death and destruction, evil
Good gods do not care if you kill evil creatures and vice versa. In most cases common sense is good enough to determine what is evil and what not. There might be some gray areas and few surprises though.
Being nice and doing good deeds and opposing evil generally brings you closer to the good gods and doing the opposite casts your lot with the lowest of the low.