for the headlights, you will need to take them out and bake them to open them. Once open you can clean out the inside and outside, use wet sandpaper and then a polish..they will be like new. For the lights you can do a retrofit if you want nice legal good looking safe for you and others HID headlights. I am not going to cover than but read up about it on here. good resources are lightwerks and retro-solutions for items info and pricing. you can also do a lot with the fog lights, or get a front bar with rally lights on it
edit get some new sealant for good measure its called bytul sealent (something like that)