Try this all purpose simple wish spell:
Sit crossed legged and have both of your arms stretched outward. Put the hand you write with in a fist and the hand you don't write with open. Close your eyes and concentrate on what you want. Feel the energy transmit through your open hand to the rest of your body until it gets to your hand in a fist. When you feel ready through your arms to your right side (or left if you're left handed). Scream what you want. Than open up your hand in a fist while throughing your arms forward. It should look like you're throughing a ball at something.
In my experience, any sort of preparation that helps you focus can be beneficial. Everyone is different, it's ridiculous to expect there to be a set standard of rules that all should follow for all things.