Hi Belbo,
You've asked a great question, and you'll get a whole range of responses. Some may suggest getting a polisher, but for what I'm assuming is a daily driver, driven by someone who isn't looking for a show car finish, save yourself some money and don't worry about the polisher. For great results, give the car a good solid wash with a quality soap. Look up the 2 bucket method if you aren't familiar with it already. This is a good practice for all car washing, so the two buckets and grit guards won't be one-time use items. After washing, clay bar all of the paint and glass. You can find clay bar kits at your local Wal-Mart, or buy something from Autogeek. This will create a very smooth surface, and prepare the paint for your wax. You can use a cleaner wax which will remove some shallow defects in the paint, but if maximum protection is what you're looking for, go with a paint sealant or Collinite 845. Collinite is one of the best bargains out there!
As for the black trim, there are many trim restorers and dressings out there. Is the trim faded or is it still nice and black? If it's faded, you'll need something to bring it back to life. Once we know the condition of the black trim, people here will be able to give you the solutions you're looking for.