AG has some great packages that offer a machine, liquid compounds/polishes and pads all in one. I got a great deal on my Flex with some Menzerna products and Lake Country pads to get started on a nice compliment to my Makita rotary setup, but I'd recommend the Porter Cable or Meguiars G110 V.2 to someone without experience.
Do some homework on your own and get as many product reviews and opinions as possible before settling on one. ASK TONS OF QUESTIONS. That's what we are here for. Once you know which machine you'll be picking up, do the same type research on any compounds, polishes, glazes etc. you want to start off with.
Look into:
Meguiars
Optimum
Menzerna
Wolfgang
There are a lot of fans of varying products that will tell you "just go buy xxx I use it every day and it is the best thing I've ever used" but keep in mind that there are different strokes for different folks.
Click and read EVERY link Bobby posted ^^^
Get as many opinions as you can, buy small quantities of things you want to try and eventually you'll form a bond with certain product combinations that will form your own personal recipe for detail supremacy.