How do I make a wall and how can i do without the character cross it?

easy to realize that im beginner,kk
I can make wall in blender or order program or can i make on unity?
and how do for the character do not cross it?
thanks a lot!
Obs:im not a bum,im effort,i have watched a lot of tutorials but i didnt find nothing.

 

You need to add some physic magic on your wall and character.

First you need to add a collider on your wall and then a CharacterController on your character.

Take a look at our doc for an overview of the physic system.
http://docs.unity3d.com/Manual/PhysicsOverview.html

If you have more specific question after you read this feel free to ask them here.

Best regards,
Sonny