The most effective way to develop biceps is "curls." Put the appropriate amount of weight plates on a bar ~1.5 - 2 meters long. Grasp the bar with your palms outward and your elbows at your sides. Lift the bar to waist level. Then "curl" the bar by pivoting at your elbows, bringing the bar under your chin. Release to waist level and repeat. You should select an overall weight that allows you to repeat at least 20 curls without debilitating pain, and to rest for a minute between each "set" of 20 curls.