The correct thing to choose in the network setup wizard would be my computer connects through another computer on the network (the other computer being your router). But I advise that you not use the wizard as it has a tendancy to screw up networks instead of make them, lol. You should be good to go as soon as you plugged in the network cable.
To share the printer just go to printers in the control panel, right click on your printer, choose sharing, (if there is a little disclaimer link click it and choose just enable file sharing), choose to share the printer and give it a diff share name if you wish, and hit ok.
If both computers are runnin xp the other computer might automatically install the printer. Check printers in the control panel before installing it manually. If it didn't install automatically go to start, run, type in \\(other computer's name)\ and hit enter. The printer should show up in a window and you just have to double click on it to install it.
<A HREF="http://www.folken.net/myrig.htm" target="_new">My precious...</A>