You didn't say why you need to bleed the brakes, but air in the lines is the usual reason that needs to be done. If you don't know how air got on there I would look for that first.
If you feel like buying a vacuum pump you could use that method for bleeding the brakes. It just sucks the brake fluid out and instructions for using it would come with it.
The old way of bleeding brakes requires two people, one to pump up the brakes and the other to open the bleeder screw on the wheel cylinders.
I usually attach a clear plastic line to the bleeder screw which lets you see the fluid coming out plus lets you run the fluid into a can which helps from making a mess.
First make sure all bleeder screws will open, then fill the master cyl with fluid.
The guy in the truck pumps the brakes, 3 or 4 good pumps and then holds pressure on the pedal. Yells to the guy under the truck, "I'm holding"
Then the guy under the truck opens a bleeder screw for a short time to let some fluid out.
When he has the bleeder screw closed he yells to the guy in the truck "Closed"
The guy in the truck can not let pressure off the pedal until he hears that the line has been closed.
Once the line is closed the guy in the truck can pump up the brakes again and repeat the procedure again.
Do that at each wheel and the brake pedal should start to get harder.
If it still feels spongy repeat the whole procedure again till all of the air is bled from the lines. Check the master cyl to make sure it does not run out of fluid.
Don't be surprised if the person in the truck doing the pumping has a tired leg when you get done.
I hope this helps you "get r done"
Dan