for the rear derailer put the bike in high gear. tighten up cable so there is no slack. If this is a friction shifter its different then a index. The friction can adjust to the gear while in motion, the index has to be spot on. If your lucky and have an adjustment nut right near your derailer you will be able to fine tune your shifting right there. If not then you have to adjust the cable till it hits the gears right. The front derailer needs to be put in the lowest gear so you can take up all the slack in cable. The easiest way to set these derailers is on a bike stand. If you don't have one then tie bike in the air with ropes so you can run bike thru gears. The front derailer should shift ok and just need to set stop screws for going to far in or to far out. Thats about it.