Michael has good advice. I will amend it with a removal of the 90% fill factor recommendation. Many indexes in SQL Server can and should be 100% FF (or 95-100). Many others (GUIDs anyone?, partial-inserts-then-updated scenarios and some others) need to be 80-85% or even lower.

In the best case, EVERY index in your system will have a fill factor set specifically for that index for specific reason(s).

I do supposed if you can't do any research at all (like finding leading-column GUIDs) then 90% could be a decent middle-ground.