At your age, I would be spending my money on more important things, preferably things with boobs.
First things first I would get a suspension lift and tires, if your looking for more offroad ability and more mall crawling ability. (Which applies to said things with boobs)
More lights are going to make it easier to see at night, but will not have any effect on things with boobs.
A new exhaust is going to make your truck sound better, and thats about it. (Which can sometimes apply to things with boobs)
Do you have tinted windows and speakers capable of serious bass? I have found that getting said things with boobs to do certain things is easier with tinted windows.
How much money are you looking to spend?