ok, i'm assuming you are talking about this grain bill:
8 lbs. 2-Row Pale Malt
2 lbs. Vienna Malt
0.5 lb. Crystal 10L Malt
if you are using a 5 gallon pot, i would suggest 3.25 gallons of water for your mash. that's 1.24qt/lb and 4.09 gallons, according to promash. leave you just enough headspace...enough room to do your work.
as for sparge...go with as much water as you can. if you can boil 6+ gallons, go with 4+ gallon sparge.
for batch sparging, you're basically running as much hot water through the grains as you can to extract more sugars. very basic interpretation, but that's the jist.
let me know if you run into any trouble...i don't seem to leave this place