It also helps to know whether you'll be in an outdoor or indoor stadium, as it is ill-advised to wear a jetpack or a fireworks shooter on your back if you will be throwing your pitch in a domed structure.
Step 2: DO NOT SING THE NATIONAL ANTHEM
By the time you are out on the field, this will have already happened. There is no need for it to happen again. Rest assured that no one will doubt your patriotism if you do not sing it, though Canadians may appreciate hearing their anthem if you feel like you can generate enough volume. You may also sing "God Bless America" or any songs from Neil Diamond's catalog if you can afford to bring your own microphone and sequined, blouse-like shirt.
Step 3: WAVE LIKE CRAZY
When you are brought out onto the field, you will be ushered out in a golf-cart-like vehicle that makes you look like a paraplegic invalid. To prove to the crowd that you are not paralyzed, you will want to wave vigorously throughout the entire ride to the pitcher's mound. Only then will the audience be convinced that you are not some cripple they brought out there for some unanimous pity and platitudes involving being a "team player."
You may, however, want to avoid waving so hard that you give off the impression that you are going through a spastic epileptic seizure. Find a balance. You may only want to take mild stimulant or depressant drugs beforehand, depending on your normal physical disposition.