There are many formulas for leaders out there in books & on the web. Take a look around & you'll find more formulas that you can make leaders for. You'll need a bunch of mono line in different diameters, a measuring stick, & some nippers. Then it's just a matter of sitting down to make some up. This can be a great way to spend a cold winter's night, when you get tired of sitting behind the tying vise.
There are countless ways & methods to make up leaders. The video below shows one way, which will work well for you if you're just getting started.
After you've tied up a bunch of leaders, then comes the fun part of trying them out to see if the formula works for you. If not, make a new leader, adjusting it accordingly. You'll be surprised at what you can learn from doing this.