Need explanations on WinISD Gain/phase/group delay graph

I just installed WinISD, and it seem to be a very useful program... cant wait to use it to design my next set of speakers, but, i chose a peerless driver just playing around, and messed with the box volume and port tuning a bit, and ended up with the attached curves. I would just like someone who knows more than me about stereos to explain how to interperet the graphs and the way i need to try to get the line, for instance, with the gain, do i want the line to hug 0db? or just stay between 0 and -3?... what does the phase really mean and do?, and whats this group delay all about?
Thanks a lot, even explaining one aspect of one graph will help,
Evan.
 

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