Here's the way I done it on my car which was a completely dry system w/plenty of air in the system: First off, I bench bled the master cylinder, topped it off with brake fluid then installed it on the car and hooked up the brake lines.....I pumped the brake pedal many, many times to get the fluid flowing through the brake lines and into the wheel cylinders and calipers, in this process, I checked the master cylinder to make sure it hasn't run dry of brake fluid or it would have to be bled again, I made sure the master was always topped off with fluid....I then started the brake bleeding process, starting with the right rear and ending with the left front.....If you have bubbles appearing, you're on your way but keep in mind, it's going to take a while, especially gravity bleeding them, but eventually you'll bleed all the air bubbles out of the system....I've heard this process could take up to a year so just be patient! hehehe ....NO, just kidding, but pressure or power bleeding is alot faster than gravity bleeding!
Also, make sure you check the master cylinder often and keep it filled up.....Don't let it run dry!