If you are evil you can go around killing people because you are bored(if the character would). Mass murderers exist in the real world, so there is no reason not to be one in the game. Its a good idea, though, to have a role why your character is a psychotic mass murderer. Really, for the most part, you just have to step back and think...what would my character do? If your character would kill for that shiny sword, then go for it. If not, well...I would not. Alignment and race is a good start. If you join a cabal(and make sure your character would), you need to consider that as well.

Dying happens(though it may or may not be a lot, though expect the worse), just keep in mind that some people like playing evil characters and will kill you(or at least try, if they have a reason, even if its just for fun).

Also, play what you want. Don't play a warrior(or another suggested race) if you really don't want to. You are likely to die either way, so play that mage if it appeals to you(or that warrior if that does it for you).

-Alenysi