Get a nice contacts with your reins to the horses mouth. Make sure you keep your legs tight so you press the horses in front of you.
Get a bit more contact with the outside rain and play with ur inside rein and get ur inside leg bag and do lots of little kicks I found it helps me if I'm struggling sometimes to go stirrupless
With a young horse you should not worry about the mouth or head or neck at all for the first months of his training. Focus on getting him forward and off your leg, and understanding how to bend through the corners. Once that's established, you'll find that when you pick up slightly on the reins, they will naturally frame up. A correct frame comes from the hind end through the back and into the mouth, and doesn't start at the front.