why in such a hurry, ya don't even have the tank yet
but anyhow, for a late response.. you can put your return anywhere in the tank you want.. just make sure it is only a little bit below the water surface. If it's deeper, drill a hole in the pipe just below the water level so the syphon will stop when power goes out. You might want to do a search on a spraybar=much better way to return water into the tank.
the protein skimmer goes in your sump, if it's an in-sump model. If it's a HOB (hang on back) model, put it on the back of your tank, anywhere is fine along the back edge.. you might could put it in your sump if you water level will be high enough in there. If it's an external (not insump or hang on back) then put it wherever it is easy to do the plumbing.
hope that helps some..