Hi Christina! Wow, not being an expierienced dog owner yet having a Vizsla, you;re very brave....
First, consider getting a good trainer. Ask your vet, interview a few people, see who clicks with you and he. If you're not really experienced, it's hard to know what to do, basic intuition doesn't always work. Go over to Amazon and get "Mother Knows Best" by Carol Lea Benjamin, it is a wonderful primer on dog training.
So, since the issue here is training, your boy (and you!) need some basic obedience training... I would highly suggest NOT doing any hunting training or field work as that requires a level of training and discipline neither of you are quite at just yet. The easy leader ( the leash around the snout) works well, but not initially. Read the instructions that were included and stay with it, you want to practice with him in the yard or in the house where you have control over him, as you've experienced, you don't have a lot of control initially as he thrashes about. Outside in the world, you want one of those chrome chain collars until he gets the easy leader......make sure it can slide tightly over his head but not so loose that if he stops he can slide out. Have the salesperson show you how to put it on, you basically slip on eend thru the "O" ring so it looks like a "P" for "Perfect" as you face him. When he pulls, you give him a sharp pull AND RELEASE and say "Heel".
Exercise is key for V's, they are typically like tightly coiled springs. He needs off lead time where he can run extensively...either in a safe enclosed space, preferably with the company of another known dog, or on a safe hiking trail.
Lastly..even though there's so much more to say, I know...the easiest way to train your dog is to tune into him, and in the course of your time together watch for him doing the things that you want....watch for him to sit down, come over to you, be quiet, eat, lay down, stay off, etc., and AS HE'S DOING IT, say it to him, with praise, so he learns to associate his actions with your words..so, "Good sit!, good boy!"