Do some scouting, and note the doves routes. If you don't pressure them too much, they'll pretty much stick to the routes. Check the power lines. Doves love to perch on them. Some guys even erect "fake" power lines to help attract doves the their property. After shooting a few birds, or after many misses, you may need to move a bit.
I used to use field & range loads for doves, but have had better luck with heavy game or high brass heavy game #7,7.5 or 8 shot. They're a little more $$ upfront, but the extra speed of the shot resulted in more birds with fewer shots.
Skeet, Cylinder, and Improved cylinder are all good chokes for dove. Later in the season you may have to switch to a Modified choke for the extra range if the birds get skittish and start giving you a wide berth. To quote a friend, "Late season doves will put moves on you that Ajax won't take off." You'll see.