Should be some tutorials or videos about flushing, but I'll try to cover it here. You need a partner, a container of fluid, a turkey baster syringe, a box wrench that fits the bleeder nipples, a piece of vinyl tubing about 2' long that snaps on to the nipple and an old soda bottle.
#1 Open the master cylinder reservoir and use the baster to suck as much old fluid as possible out. Replace it with fresh fluid. Caution, this shit will destroy everything it drips on! especially paint.
#2 Go to the right rear wheel and put the hose on the bleeder. Put the other end in the bottle. Now have your helper pump the brakes and hold pressure. You then crack the bleeder open until there is fluid shooting out the hose. (If the car was never serviced this will be an alarming mix of dirty fluid and gunk that looks like old grille scrapings.) As you are releasing the fluid your partners foot is rapidly heading to the floor, their job is to yell stop before they hit the floor. You then tighten the bleeder and repeat the procedure. Continue this until the fluid looks like the stuff in the new bottle.
#3 Repeat on the other side, then move up front, always work from the wheel furthest from the master to the closest one. Always monitor your master cylinder to confirm that you are keeping it full while draining the lines.
Once you scrounge the tools up, the whole job only costs a few bucks for a qt. of fluid, and it has many benefits. The pedal feel improves and the whole system, particularly calipers, tend to last a lot longer with fresh juice in the system.