These are a couple of good sites for getting napoleonic models:
These guys do both metal and plastic (also they are ex-games workshop staff, so their models are of high quality)
http://www.perry-miniatures.com/ These guys give you more bang for your buck, (each set gives you ~50 men and costs ~£20 per box, also their deals are pretty good) They're also the guys I decided to go with, it was close between these guys and ones above. They also specialize in 28mm, which are my personal favorites.
http://www.victrixlimited.com/ Both of these sites figures can be interchanged with each other because they are so similar.
Also if you are going to paint, glue etc, I would go for citadel paints, glue, brushes etc because they are of a very high quality and can be trusted:
http://www.games-workshop.com/gws/home.jsp They also give you a few guides on how to paint and glue (although for their own ranges of models(40k, warhammer fantasy, LOTR but you can easily apply them to napoleonics.
A few good (external) forum threads and youtube links as well:
http://theminiaturespage.com/boards/topics.mv?id=133http://www.ebay.co.uk/gds/Painting-French-Napoleonic-Line-Infantry-with-Vallejo/10000000004287203/g.htmlhttps://www.baccus6mm.com/includes/howto/naps/paintguide_nap_text.phpSpoiler
[youtube]http://www.youtube.com/watch?v=vEOzbtPRE-4[/youtube]
They should all be taken with a pinch of salt as they might not be the best, but they helped me get better at painting and modelling (I am literally shite).