You should have gotten a bleeder kit with the new master cylinder. If you didn't, go back to the store, and ask them if they have a spare. It is 2 nuts with a small barbed fitting on the end, and 2 plastic tubes. You install the nuts into the line ports, and fill the master cylinder with brake fluid. Insert the 2 plastic lines into the reservoir, and the lines are held to the master with two small metal clips. Then gently depress the pedal to bleed the air out of the master. Add fluid as necessary, and keep pushing the pedal until no more air bubble appear. You must depress the brake pedal slowly, otherwise you will blow brake fluid all over the engine compartment and the fenders, doing great damage. Once the master is bled, you can go to the furthers rear wheel cylinder, and put a piece of hose on the bleeder after you open it. Put the other end of the hose into a car with a small amount of brake fluid in the bottom, enough to keep the bottom of the hose immersed. Then over the next hour, the line will self bleed. Just check it periodically, to make sure that the reservoir is kept full, and that no more air is coming out of the line. Then close that bleeder and do the next furthers one from the master cylinder, the same way. Do all 4 wheels this way, and you are done.