I wouldn't worry too much about your garden Mike. Plant it with things that you like and which are beneficial for bees (there was a book published before Christmas which updated the Hooper book from the 1940s about bee friendly plants) but your bees will be out foraging from monocultures where...
Don't be put off. I live in the middle of London, average garden, 20 feet wide, 60 feet long. My bees are fine. Go on a course, find someone to help you get started and then decide.