The suggestion for the PC kit is not a bad thing, but it's a big step from washing and waxing your car to polishing it with a random orbital polisher. It isn't difficult or dangerous, but it does require more time and effort.
Since you have the washing thing in hand, and want to try something from the DC Store, Poor Boy's PwC, Polish with Carnauba, is an excellent one step product that is also very easy to use.
Take some time before you buy too much stuff. It's awfully easy to get caught up in the buying products thing and you can end up with a bunch of stuff you never use.
Charles