How to change my 3GS iPhone layout?

I do I change my Iphone 3gs settings, the layout, how it locks, insted of the number pad, how to i get other lock codes, and how do i change my lock screen to have camera options on there without unlocking my phone? Is there anything else anyone can teach me, i really wanna learn how to use it. I have had my phone for 4 months and i can't do anything but call, text, download apps, uses, take pictures, listen to music, change my arrangement of my apps, and change my backgrounds, someone please help me! I know nothing about this phone!

The camera option on the lock screen is only for iphone 4:) and you'd have to jailbreak to get other codes

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