Photoshop -- Sig HELP

[WeaponssBug]

I have seen a lot of pretty nice looking sigs on these boards, as well as others, and want to know what I can do to spice mine up a bit.


I have Photoshop 7.0
I want to make .jpeg sigs from screenshots, etc.


I have a....few....questions.


To start -- How would I cut part of an image, transfer it to another imagine, ie, on top of it.

Also, how can I generally improve image quality and sharpness, and also, where can I find some useful tool tips?

Sort of broad, yes, but anything else plus this I should know.