Newbie with visions......

Hello everyone. I think everyone starts with FS and then gets interest in other things. I have taken interest in Scenery, but i don't want to get in too deep making cities or anything. I want to make airfields.
My question is: What programs out there ( freeware) are useful fo rmaking scenery?
Thanks.
My question is: What programs out there ( freeware) are useful fo rmaking scenery?
Thanks.
