Yes, as FitSport says, claying is very very important. If you are going by hand, you are probably going to be limited to fillers rather than abrasives unless you want to spend a really really long time doing it.
Maybe just get some KAIO or JW prime strong and top it with some collinite 915 which has great looks and insane durability.
Also, the age of the car very often has little to do with how many swirls it has, I have seen brand spankin` new 2007 cars that are swirled to heck straight from the dealership. In fact, its more common for me to see new cars that come swirled than to see ones that come with none!
Shows you how careful dealerships are when they wash your car... I am sure some know what they are doing, but far too many come right out swirled from day one.