Bleeding brakes for the first time...need help

[lukecp]

I put a new passenger side rear wheel cylinder in my truck today, b/c the old one was leaking brake fluid pretty bad. I got the old one out, put the new one in, and went to bleed the brakes. I pumped the pedal a couple times, with the engine off (truck has PB). After all the vaccum was out of the lines, i had a friend hold down the brake pedal and i opened the bleeder valve. Some air and some brake fluid came out. Anyway, we did this a couple times, until i accidently left the bleeder valve open as my friend let off the brake pedal. Now, when i try to bleed them, no or very little brake fluid comes out. When we took off the master cylinder cap, and slowly pressed down on the brake pedal, air bubbles come up. So....what is the easiest way for me to fix this? Just keep pressing the brake pedal slowly over and over until air bubbles stop comming out of the master cylinder, or is there an easier way? Right now, the brake pedal is super mushy, and the rear brakes don't work at all.