Man I tell ya...I have plumbed many tanks and I have never had a magic recipe or a specific parts list of everything I need to get the tank running. I think that this is part of the appeal of the hobby for me - kinda like putting together a puzzle.
Best bet is to get your pump and overflow and see what size parts they will accept. If the overflow includes a drain hose then the only thing you will need is return plumbing.
Check the output size of your eheim and be prepared to make a couple few trips to big orange box harware store. Bring the pump or other parts with you if you have to. You will probably need at least a 3-4 foot peice of vinyl tubing, a barb adapter, some PVC elbows, etc.