Best case scenario is to put a suppressor on it, if you have the financial means. Some people don't know that suppressors actually reduce recoil. Some do so fairly well. Inhave two friends that got cans in under a week, just this week.
If a suppressor isn't an option, the other thing you could do on an budget is to add weight to the rifle. Go to tractor supply and buy their bulk pack of copper coated lead BBs. Take a screw driver and remove the butt padd on the rifle. If there is a foam insert inside the stock, take it out. Fill the stock with the BBs, and put the butt pad back on. You can add up to 4lbs to the rifle which will reduce recoil by about 30% depending on starting weight.
If you are going to put a muzzle brake on ,just know that studies show that youth and new shooters are actually more adverse to the noise than they are the recoil, so use well placed foam inserts into the ear when practicing and headphones when hunting, when he get to that point.
The cheap Caldwells headphones that have a sound magnification work great in a hunting situation as you can 'whisper ' to one another with hearing protection in place.