Dakota,
My father was an excellent dove hunter. I remember going with him, only to retrieve birds (I was too young), near Waco, TX. He would get permission from a landowner, usually a rancher, then hide next to a stock tank. A water source is always good.
That is one suggestion. Another I have is, my father would buy the most expensive, high brass, 2 3/4" shells. Many years later, during a conversation with him about dove hunting, I told him I buy the least expensive #7 or #8 shot I can find. With the cheaper shells, I told him my per box average did not drop, which is mostly because I shoot at very close ranges and do as much jump shooting as possible. A couple of years later, he told me he changed to the cheaper shells and was able to bust as many doves as with the more expensive shells.
Here is another suggestion. Shoot them at close ranges and while they are going away or coming to you. This is because there isn't as much leading to do as with birds flying left to right or right to left. Also, if you can find a sun flower field or other field that has been cut to a height or has a natural height of stubble to your waist, walk the field and jump shoot them. Keep your gun at the ready position and not on your shoulder. For me, jump shooting is always more productive because your shots are almost always going away and very close. As another blogger said, watch your low shots because you may be shooting in the direction of another hunter. With jump shooting this is the case. Avoid the temptation of shooting at long ranges.
I never use a pump or semi-auto gun because the third shot is almost always a wasted shot. I prefer an over-under 12 or 20 ga or a side-by-side 12 or 20 ga.
Pick up your empty hulls, especially if you are on private land.
Here is my final suggestion. Go to Arizona during Christmas. If you are in the right field (it's hard not to be in the right field), you will see so many doves, you won't know which way to shoot. As a plus, many of these areas have Gamble's quail. Arizona has four types of doves. They are, white wing, mourning, Urasian collared and the tiny Aztec dove. The Aztec is about 3/4 the size of a mourning dove and, although it flies at about the same speed as a mourning dove, it appears to fly like greased lightning and they are hard to hit.