This should probably be in the Rules forum, but... I'll field it because if it's going to get moved my answer'll go right with it. Alright - I'll go down through easiest to hardest.
Racial Modifiers - Most people, I believe, ignore the rules for Intelligence scores of less than 10 in the DMG - just use the same method of finding the ability mods for any other stat. That said, in case you don't know those rules... for an odd stat, subtract 11 from the listed score in the MM (or other monster location), divide by 2, and that's the bonus/penalty. For an even stat, subtract 10, divide by 2, and THAT'S the bonus/penalty. It's pretty straightforward that way. Considering THEY ignored the 'Intelligence Chart' for the Half-Orc...
You know what, my comps. being stupid and I've almost lost this message three times... I'll finish it later if no one else does first...