Multiply that delta value by 100 to get the position delta. A low enough delta doesn't need to be hedged that tightly. It's probably futile, as it's pretty difficult to dynamically hedge with a smaller account due to transaction costs, etc.
"Options, Futures, and Other Derivatives" is the one to study. Covers a lot, a prerequisite to other more specific sources. "Fundamental's..." is sort of a primer for the main book. Covers some of it, but excludes the math.
Uncomfortable being short D here. But it does seem a little overextended.
EDIT: A little better now that it closed under 650. Looking for a touch of 645 tomorrow.