Thanks guys an it's not drilled I was just going to see if I could run the piping without drilling it
There are HOB overflow boxes you can get to accomplish this. Keep in mind that this technique does introduce more risk of flooding.
With an undrilled tank, I would either drill it (not as scary as it sounds - assuming the tank is not temperred), or go sumpless. Sumpless can be accomplished buy just using HOB equipment (i.e. skimmer, refugium, etc) or by partitioning part of the tank to assume the sump role (this is common for Nanos and Picos).
If you want to use and HOB overflow box, you will need to pick one (perhaps other can advise which one to select), then we can help with the plumbing. When choosing a return pump, take into account the head pressure. For example, if you simply have the sump under the tank then figure six feet of head pressure, in which case a Mag 7 or 9.5 would suffice. I am not recommending those pumps (although I have used them both and will continue to use Mag pumps), it is just a point of reference. Consider DC pumps, they are supposedly really quiet, versus the Mag pumps and other AC pumps which are a bit noisy.
For plumbing an under the tank sump, consider flex tubing. It is more expensive, but easier to maintain and set up. There is nothing wrong with going PVC, personally, that is what I use, but it is pretty finite and if you want to make changes to the setup it adds more complications. I could go on and on about plumbing, lol... If you do go PVC, plumb to the top of the sump chamber, not to the top of the sump... if that makes any sense...