Today I’m going to show you how to break 10-ball. It’s essentially the same process as when you break 8 ball: Hit the 1 ball head-on, not off to the side. You want ALL your force to go into the ball.
I personally go one diamond up and one diamond over but you can hit it anywhere, as long as you hit it with straight-on force. You still want to keep your body weight leaning back so you can throw that body weight forward when you break. That will transmit the full force of your body to the shot.
You can also break off the rail if you prefer. The biggest thing is getting that force moving forward and hitting the lead ball head-on. If you do it correctly, the balls should scatter pretty well and the cue ball should end up close to the center of the table.