Hey, welcome to the forum, and congrats on the car!
1. I own a 2001 Optima, so I'm not sure how similar our light assemblies are, but on my car, there's just 2 bolts you have to undo on the top, and the rest is held together with little plastic clips. After you take the bolts off you can pull the lamp assembly straight out. Whenever in doubt about these things though, you can always register for free at
http://www.kiatechinfo.com and look up the shop manual for your car online.
2. My + and - have never had lights, never knew they were supposed to. Though if they do, I've heard that the shifter is a pain in the ass to take off. Hopefully Tum will post here in a bit (hint hint :P). He's done it before for a mod and should be able to give you a run-down.