Pre-Step: This usually springs from boredom, or inspiration. Don't ask people where to get it from, that should be your own, that's what will make you unique.
Step One: Once you have acquired the Pre-Step, this step comes into play. Doodle. Just begin to use the Pre-Step to let your imagination flow freely.
Step Two: Now that you have doodled good and plenty, find a character you like. Repeat to continually draw this character over and over, he/she/it will change. Draw it the character 10-25 times. After a while, you'll stick to a certain design, and eventually they will begin to develop a personality, who that character is.
Step Three: You've got steps one and two down, that's great. Now for background info. Family,friends,history, etc.
Finalization: Story time. Is this a flash where there is no "real" story, and shit happens, your character a super hero or something? Once you have Step 1-3(including pre-step) the finalization will be a breeze.
As long as you follow this, you're good to go!