Piccolo is a easy level fight, designed to allow you to get familiar with the controls. Piccolo can basically be defeated with ki blasts and special moves alone, but you may want to use melee to keep the fight from lasting too long.
The Piccolo fight is a great opportunity to practice the game controls. At the very least learn to move around, teleport, and block. Things get much tougher after this fight. Raditz is the next challenge.