I added a model
of a house and garden, so when i click play my character is like on invisible floor above it
This is most likely the auto-generated collision. When you import a model you can choose to have the collision auto-generated or not. If you have it on, it will choose the outside points and make a convex/box around it. If you open the static mesh in Unreal Engine you can click on Show > Collisions. Then you can select the collision and delete it. You will want to make a custom collision for your mesh most likely, here is some documentation on practices and how to do it: FBX Static Mesh Pipeline | Unreal Engine 4.27 Documentation
Scroll down to the collision section in the documentation.
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