Those sprites are friggin awesome. I love the badger, haha.

You can try searching Google for stuff like "Flash AS3 platformer tutorial". You should be able to find something that will get you started. I'd recommend trying to find something AS3 specific because it's easier to find resources on AS3 rather than AS2 these days.

I found this video on YouTube which seems to give a clear explanation from start to finish... http://www.youtube.com/watch?v=tSRNMHt_8JQ

If you ever get lost or stuck on a problem, search forums or Google. Ask as a last resort, because there's always someone that's had the same problem and a lot of the time you can find an answer really quick.

Keep with it! Looks like you'll make something sweet if you keep at it.