This is pretty easy. I love CPR's overflows. They have a nipple on top that you can attach an aqua lifter pump to so make sure no bubbles form in the "U" and loose the siphon. Siphon loss can lead to overflowing issues.
But, you'll want to get a return pump rated higher gph
than the overflow then put a ball valve after the return pump so you can then restrict the flow coming into the tank from there until it matches up with the overflow.
The rest is simple PVC
or flex tubing plumbing...with PVC
being the best of the two in my experience.