>1. I was looking at the horzontal (BYG?)boxes. What benefit do they have, if any, over the standard box?
No lifting of 90 pound boxes.http://www.bushfarms.com/beeslazy.htm#horizontalhiveshttp://www.bushfarms.com/beeshorizontalhives.htm
>2. Not much sun in our yard due to our back yard full of trees and neigbor's trees covering the front yard. Best place for sun is right next to the driveway, which is used daily of course. Probably not ideal. Is it okay to place them in the shade?
Yes. It's ok.http://www.bushfarms.com/beesfaqs.htm#locating
>3. JUST THIS WEEK, I found a hive in a hollowed out tree. Tree is still standing and I think I would need a vac to get them out.
A vac will not get them out.http://www.bushfarms.com/beesferal.htm#beevacuum
This will get some out:http://www.bushfarms.com/beesferal.htm#conemethod
>I'm I too late in the year to get the tools necessary to start with this hive?
It's too late to be very confident of them building up enough to get through the winter, but they might. http://www.bushfarms.com/beesferal.htm#removal
>4. Should I start with one or two.
Always two. With two you have resources to deal with possible queenlessness (open brood) or laying workers (open brood) or a weak hive (emerging brood maybe frames of honey). With one you do not.
> Again, the honey I will probably just give to friend and family, unless it becomes too much, then we will start selling at the local farmer's market.
With two hives you will have trouble giving it all away in a good year.
>5. Looks like anywhere between $300-$500 to get started with one. Is that about right?
That's a good guess.http://www.bushfarms.com/beesnewbees.htm