The BeatStep isn't really designed to control Logic that way. It's possible but if you're just getting started and want something that 'Just Works'[tm] then you might consider a controller with a dedicated Logic Pro mode.
Most of the inexpensive ones will only allow you to control volume, pan, mute, solo and/or track arm (like the Korg NanoKontrol line). More money... more control.
If you have an iPad/iPhone there are good number of apps out there that will control Logic with plenty of depth (including plugins). Android might have some too but I'm not sure.