If its your first go. Just get one of the kits. 3m, megs... Just get one that you can attach to a drill or other tool. Doing this by hand is miserable, but I Hate sanding so maybe it's not that big of a deal.
They come with everything you'll need to finish the job properly. Don't do the DIY pastes or baking sodas, they don't work and might just make the surface worse.
It takes longer to do than you think, even with a drill. When you think you have the surface fully sanded, keep going. Some folks will use a sharpie inbetween grits to make sure they've removed all the scratches from the previous grit.
Then when you're ready to re-seal make sure you get the surface super clean. Rubbing alcohol on a lint free applicator works well.
Finally Either pull the lamps, or tape around them very well. Use multiple layers of tape. If you're using a drill or power tool to do it you can burn through a single layer of tape pretty quickly.