Public Commander Keen Forum

Thanks everyone! I've started playing Keen4 and it's been very fun so far

I bet this thread has been done before but i'm too lazy to look for it. Anyway, I know pretty much nothing about Commander Keen, i've never played any of its games in my life, but just like 20 minutes ago I figured i'd give it a shot. But the thing is I don't know where to begin. Which game should I...