Dave -
The conventional wisdom says that it is not really realistic
to attempt to plant crops for the collection of nector.
My experience is that it is probably true.  Even with ten
acres, the bees will fly well beyond it (perhaps as much as
three miles) to find the nector source they want.
If you do decide to plant for the bees, there is a
book available from the bee supply houses on
honey plants.  Or, read a few back issues of
Gleenings in Bee Culture.  there have been a
number of articles in there.  Before you plant
I suggest you check with the local forestry
department.  there are some plants you would rather
not introduce.
good luck in your endeavor...
Larry Krengel