One good thing for you is your tank not all that big, but cost wise it can still be up where your lease to expect it will be. What you need to look for is a siphon over flow box, smaller tank for your sump and skimmer, and a return pump with tubing for your return, it will need to match the flow rate of the siphon overflow box, which should also have some type of adjustment control. You best need to hear from those who deal with these items most. Myself, I prefer to drill my tanks.
Buddy