I'm just starting in home automation and though of starting simple.
For my first attempt, I'd like to control lights form my computer. That's it... for now

I'm looking into the Z-sick Series 2 for it but have some questions.
To set up a Z-Wave network the Stick and a Dimmer module are enough? Do I need any central "router" or controller? Or do those 2 devices connect to each other and the network is set?
How well will the stick work with a Mac? I have a home server running 24/7 on a Mac. What softwares would you guys recommend ? Any free ones to get started?
Also what kind of dimmer module should I get so I can still control the lights from the normal switch on the wall? So I don't need the computer every time I want to turn the lights on?
Finally how hard is it to control the Stick with AppleScript? I have some knowledge of it and would like to write some custom scripts ( which I'd be glad to share once they work well

That's it for now. Sorry if it sounds like I know nothing, but I'm really starting from scratch.
Thank you!