For a begining archer this might be overlooked , most of them shoot what the shop gives them .
For those that are experianced , this is the starting point of tuneing .
Heres a link for you from an experianced guy who preaches spine tuneing as THE most important aspect .

http://domino.htcomp.net/ragsdale.nsf

To answer archer58's questions , get the bow you can pull , and then the arrows to match , then fine tune the spine for a "forgiving" setup
Overspined arrows are not the answer , corectly spined arrows are .
Slightly overs[ined is usely more forgiveing than slightly underspined thats why they are sugested , grossly overspined arrows can be very hard or imposable to tune , when compared to the corectly spined arrows .