Hi - More sun than you can imagine (unless you're in the deep south), but water far less often (it can almost just about dry out) then do it quite slowly, over and over til all the soil is slaked, and let it drain well in the sink. Also see if you can provide good humidity. Try a clear plastic bag over it for a week or so - but out of direct sun unless you leave the bag bottom open (too much condensation will cause trouble). It's also best to add lots of grit and small gravel to the mix when you repot - the less peaty potting soil the better.

I have an Olive tree that I trained from a 5 gal can back in 1979. I am in California but I find that Olives don't need to be babied. Yes they will lose leaves and sprout new ones. You can kill it with kindness. Don't forget they grow in the deserts of Israel.