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firmly against your shoulder. Pull the hammer to full-cock, and aim the muzzle at your target. Be sure that no one is standing directly beside you in front of the touch hole. Sparks will fly and you want to make sure everyone is clear of the expulsion. Always wear the appropriate ear and eye protection when firing a muzzleloader. It's loud. Practice good gun safety. Look down the length of the barrel through the open sights. When all three sights are in line both vertically and horizontally upon the target you wish to hit, take a deep breath and hold it. Some muzzleloaders don't have much in the way of sights. You can consider updating your old-school weapon by fitting it with more modern sights. This is especially recommended if you plan on hunting with your muzzleloader. Keep the rifle securely in your shoulder and follow through, holding your position and waiting until the smoke clears (there will be a lot) before dropping your posture and looking at your target.  In a flintlock rifle, the flint will slam down, scraping down the inside of the frizzen and flipping open the flashpan, creating sparks which fall into the powder in the now open flashpan. This powder ignites, making a flash of flame which travels into the touch hole and ignites the main charge.
Secure the butt of the gun Aim the rifle. Remove the safety and squeeze the trigger.