You need to have a licenced copy of maya for every computer you have. I think there is some kind of deal with mental ray render licences that you'd have to check out with the version of maya you use. It's all pretty straightforward. If you want to do it properly you'd need some render farm/dispatching software like Spider, Smedge or Apple's own QMaster.
Frankly it's easier (and this is what I do) to not bother with wheeling out OS X server, just have two machines both with maya installed. When you need to render move the scene over to your render computer and set the batch going. Then you can keep going on your other machine. If you're done for the day and want to do overnight rendering/caching etc then just render, say, frames 1001-1050 on machine A and 1051-1100 on machine B. Easier for such a small number of machines.
If you wanted to set up 4 or 5 machines then we're talking about another kettle of fish and you'd need a dispatcher.
PS - maya on mac sux. Take my advice and work in windows/linux.