You'll need a dog for grouse and pheasant. You can go hunting without one, but you likely won't get anything. Maybe grouse in the right terrain. Do a search for hunting clubs in your area. Also, if you have never shot trap before, do it. Trap mimics grouse and pheasant flight. Hunting over dogs is a hoot.
Turkeys are different. First, you have to put in time scouting it you don't already know where they are. Ask fish and game, etc., to find a general area. Then scout by getting in that area an hour or two before sunrise. You'll hear them gobble as they start to awaken at first light. You'll need good camo, including face, and some kind of decoy. Also a call to match the type of decoy you use, whether it be hen or tom. A great deal of patience is required. Say you hear a tom and you start calling. Don't assume he's split the scene or start moving around just because an hour has passed. He may be quietly and slowly working his way to you. What's fun is when one is hot to trot and covers a lot of ground running at you, then stops and dances around fanning. Turkeys are a blast and you don't need dogs or any kind of support.