Hi Donpakundo, welcome to the Cameralabs forums - and congratulations on winning a Canon 400D!
I'm presuming you won a 400D kit which came with the 18-55mm lens.
This is a great lens to get you started, and if you are a newbie, I'd say stick with it until you find it limiting in some respect - that will then help you decide what your next lens should be. For example...
1: If you find it doesn't go wide enough, buy a wider angle lens, like the Canon 10-22mm.
2: If you find it doesn't zoom-in / magnify enough, then get a telephoto zoom, like a Canon 70-300mm.
3: If you find it doesn't focus close enough to subjects like flowers or insects, then get a macro lens like the Canon EF-S 60mm.
4: If you find the quality isn't as good as you hoped, or you just want something which perhaps zooms in a bit closer and has anti-shake features, then swap it for a Canon EF-S 17-85mm.
I'd honestly say though if you're starting out, the kit lens will be fine for the vast majority of the shots you wnat to take, be they landscapes portraits, close-ups etc. I'd always recommend using it for a while first to discover what direction your photography's going to take.
If your camera didn't come with a lens though, I'd recommend going for the Canon 17-85mm straightaway as it's a great general purpose lens and a good step up from the 18-55mm kit lens.
If you'd like to learn more about the differences between several general-purpose Canon lenses, check out our Canon 400D lens upgrade article here:
http://www.cameralabs.com/features/Cano ... s_upgrade/