[MarioNintendo]

http://stepmaniaonline.net/index.php?page=downloads

I suggest you take a look at the ''Stepping Stones of Stepmania'' packs, which are usually seen as some good beginner packs that manage not to be boring. Alongside that, I can't help myself from also recommending you check out StepMix packs. This is how I got started...

Basically, if you are a super beginner, try out ''pad'' packs. Sure, these are meant to be played with an actual pad with your feet, but they're good practice for playing with a keyboard, too.