I'm starting a floristry course and looking for a site with the names and pics of all the flowers and foliage

www.davesgarden.com comes VERY close with the Plant Scout feature, Latin or common name. You can do ten searches a day free, but if you are very unfamiliar you might consider the $15 a year membership. It is great because it doesn't just show you a "heuchera" but will show you a particular cultivar, "Stormy Seas". It may be the biggest and most complete graphic and informational database out there.