Gods no, this is why we have
tutorials.
It'd take me forever to explain every little detail of what makes a good scenic terrain,
however, if you start working on it and post your WIPs here in the Terrain Board, then
I and others will more than likely give you advice on the go.
For this and for parts of the previous quote I'd like to refer to
myself.
Basically, making a good looking scenic terrains using no imports is hard even for
the best terrainers, there are some few doodads that are mandatory in order to make
a scenic terrain, like the "Glow" doodad from the
UTM for lighting, and other detail
oriented doodads. And, as I stated in the cinematic contest, it is 100% possible to
make warcraft-looking terrains with decent looking imports, your terrain don't need
to look like shit just to look like warcraft, so to speak.
Oh, and, if you intend to be extremely difficult: There are loads of doodads in the UTM
that are very old and retain this so-called "wc3 look" that you're after, which will still
make it better looking than a no-import terrain would be.