Front-end alignment

[Hair]

Putting the front end back under my truck.
With wheels on the ground:
I have set the toe perfectly parallel between right and left.
I have set the camber perfectly vertical on both sides.

Now, is that right? Is toe supposed to be perfectly 0 or is there a certain angle toe in or out that is supposed to be ran? What about camber? Is that supposed to be a little in or a little out or is that supposed to be perfectly perpendicular like I have it?
I've set them as perfectly parallel and perpendicular as I can. Is that correct? I have some really nice measuring equipment so I know I do have it very close, probably closer than required, but is perfectly parallel and perpendicular right?

Here's my final question, what about caster? What is my caster supposed to be set at? I know that it is not supposed to be staright up and down. What should it be?