Timing: I'm going to sow seeds after danger of frost has past and soil temp is above 65 degrees. I could start them indoors before that, but they grow so fast once in the ground that I'd probably only gain a few days to a week at most, and starting indoors requires some significant labor. For fava beans, they are planted when the peas are planted -- first thing in the spring and possible late in the summer for a fall/winter crop.
My rows are 30" accros, so I'll plant the bush beans (the Isar) in rows across the bed, 5 or 6 inches apart, 16 inches between rows. These need to be planted in succession because they need to be harvested about every day to prevent toughness.
The pole beans will be planted using a trellis system, comprised of (3) - 8' 2x2 @ 7.5 ft. on center driven 2 feet into the ground, with a 2x2 cross piece at the top attached with a galvanized nail (drill hole to prevent splitting). In reality, any number of trellis systems would work, but this is the one I'm planning on now. The idea is to get these up in the air so the beans grow straighter, faster, and take up less ground space.
I will put the trellis down the middle of the row, and have one row of beans on each side. Untreated twine will extend down from the trellis crossbar to each bean vine, making a sort of "A" shape. At the end of the season, the plant and the twine will go in the compost pile. One advantage of the "A" frame is that it can be easily covered with plastic to make a mini-greenhouse and extend the harvest of the pole beans past the first frost a ways.
An alternate trellis would have one row of beans down the middle of the bed with one trellis on each side. Twine would extend from the trellises down to the bean plant, making a "V" shape. This wouldn't give you as many bean plants (only one row instead of two), but would make harvesting easier as gravity would help the beans hang down from the outside on the "V" frame rather that from the inside of an "A" frame. But space is limited, to I'll likely stick to the A-frame style and just deal with the slightly increased difficulty of harvesting.