As David S said, just have the pipe come straight down from the bulkhead.
You could also put a strainer end of the pvc
inside the tank and leave it pointing up. That is only if you want the water level to be higher (*versus having it pointed down).
To get your siphon started. Typically, you open the ball valve on the overflow piping all the way open. Then you turn on your return pump and the water will automatically overflow. Then dial the ball valve on the return pump line to adjust the amount of flow entering the tank. Lastly, dial the ball valve on the overflow line to reduce any noise (gurgles). But I think you were only asking on that design you drew right?