Step 1: Invent a catchy name for your cryptocurrency. Something that sounds vaguely like a disease: Flumplenax Coin
Step 2: Create a blockchain that doesn't crash every five seconds. Good luck.
Step 3: Build a website that doesn't look like it was made by a middle schooler in 2002. Hint: use a designer who actually knows what they're doing.
Step 4: Write a white paper that doesn't make people laugh. Okay, fine. Write one that just makes people roll their eyes.
Launch Day: The Moment of Truth (or the Moment of Embarrassment)