Getting started with lifting or weight training..

Hi

So i just got a gym membership and i told the employee that i wanted to do cardio & strength.
They showed me around in the gym and got some explanation about all the machines,
The only thing that they didn't show me was the free weights section.. - where all the men are all the time - (However, i'm going to ask for some help with this soon.)
The only strength thing that they showed me were the machines, i don't know all the names of the machines but they have a circuit of 10 machines where you do each machine for 1 minute and then have a rest for 30 secs.
These are the machines i'm talking about:
http://www.lifefitness.be/commercial/lfstrength/circuitseries.html
So.. is this good? Will i get some muscle definition by using these machines? Or are free weights better? What's the difference? How many times a week would you recommend doing this circuit or how long or..?
I'm just wanting to tone up a little bit and get some more definition.

Thanks.

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