Well you can do one of many things you can use the books you have and make do or. http://www.knights-n-knaves.com/osric/ you could use this which is a revamped 1st edition, or you could use this http://www.d20srd.org/ which is 3.5 or you could use this http://paizo.com/pathfinderRPG/prd/ which is pathfinder basic rules. or you could spend some money on the actual books but if you are just getting in to it and restarting then one of those options may be a good choice. I prefer having the books over digital copies but whatever works in a pinch. hope it helps.