No anybody can help?
What type of beat 'em up do you want? How many planes?
Single plane Side-scrolling (like SNES Power Rangers) or multi-plane (Like Double Dragon)?
See the problem with your question is there are just so many elements that go into making a beat 'em up and questions that arise along with it:
- 8-directional movement, solid collision boxes, enemy types, enemy ai, enemy projectile motion, enemy spawning, interactable objects character combos, enemy combos, control types, special attacks, life bar, types of special moves (grapple, bomb type, hit all enemies in screen type)
I haven't even begun to scratch the surface as there are still many elements that have to be considered like User interface. I'm not here to discourage you but I highly suggest you look into all elements you think would go into making the individual components that make up a Beat 'em up.
Start here: