First, you need a Teleport event to.. teleport the hero to wherever the first "real" map is. It's on the second tab in the Event Commands window.

At this point, change the sprite association for the hero to whatever the hero needs to be.

If you used Tint Screen to blacken the screen, now you'll want to Tint it back to 100%/100%/100%/100%.

---

My best guess is that you're teleporting, but you can't see it because the screen is still tinted black, and it looks like you're on the same map.