Hi,
you need to set the trigger fsm on the player, and you need colliders on the surface (no fsm needed)
the surface colliders you can setup in different ways depending on your project,
for example :
you can use 2 colliders @ the beginning and end of a surface kind
or you can use 1 big collider to cover the whole surface of a single kind.
for a collider you can create a box and remove the Mesh filter and you can remove or disable the mesh renderer.
(i usually disable it so i can enable it again to see what the collider covers and when i am 100% sure it is good then remove it.)
and set surface tags on it ( and don't forget to set "is Trigger"
)