Depends if you want to do any correction on the paint. As Jwade said, need to see what sort of condition the paint is in.
Do you want to use a sealant or a wax? Common consenus is that sealants are good for lighter colour cars (gives a glassier, shiny look), while a wax works better on darker cars (brings out the depth of paint better). Sealants are easier to apply, but i find if i put 2-3 layers of wax on, with proper care i wont need to touch my paint for at least 6 months.
What sort of effort do you want to put in?
Is it scratched, swirled, suffering from holograms? Do you really want to correct all imperfections, or just 'make it look better'?
Will you be doing it by hand or do you have an R/O machine?
I would suggest you get a professional to do a correction for you, get it back to how it should be, then you could put your wax on yourself. And with proper maintenance, you'll only need to look after it yourself with products you can apply by hand.
Check out some detailing sites to get an idea of what is involved, more options, etc.
www.detailparadise.com.au is a site i visit here in oz.
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