I'm not experienced, but after reading and reading and reading tons of posts and articles here, I decided on P21S GPEC because my car (04 Solara) is new like yours, and only in need of the mildest polish....Seems to be the general rule not to do anything more aggressive than you need to.
And, I'll be sealing with Megs #16 because I've used it for years and like it. For ease of use though, you may want to try P21S carnauba or its S100 equivalent. I used the GPEC and P21S carnauba combo today for the first time on my wifes RX-300 and I have to say I was impressed with the ease of application and buffing. Very little effort needed.
Along with the other suggestions already given, the Autopia guide to detailing is excellent for newbies like us, and it can be found here in e-book...I've read that twice already, and have found myself going back to it and picking up more info each time.
Hope this helps some!
--Carl