So before I go to the used computer store and spend the buck or so on a
    cheap mouse, could any of you give me some pointers or web pages that
    show this info?  It's a centris 610 (68040, 40MHz, iirc).  I'm also
    interested in hooking it up to my ethernet network, so any basic mac
    info pages would be greatly appreciated.  At very least I need to know
    what I'm talking about if I try to sell it on ebay...

As single-vendor system, old macs are exceptionally well documented.
Start here:
        http://www.lowendmac.com/quadra/c610.shtml

You will need a mouse, as other have said...

BillW

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