Bumped into a video on youtube about UNITY 5 !!! which is what we may be needing to learn now rather than Unity 3.
Anyway this video shows you how to do the INTERFACE, TERRAIN, PLANT TREES, and even a camera thing and lighting.
It also exposes you to the concept of downloading stuff you can use in Unity like other peoples free stuff they may make for everyone like Trees, Textures, etc.
This is very basic but gets you familiar with the type of stuff we will need to know. The link is:
but this is going to put the video here maybe go to youtube perhaps (by clicking on the YOUTUBE thing at the bottom right of this video) and put it in your browser favorites so you can view it better.
The name of the video on youtube is: Unity 5 Tutorial: Basics
There are links at this video on youtube that enables you to download the files you need in order to follow along with this tutorial so you click on this link once you are at youtube and viewing this video you will see links you can click on --there are two so click on the tutorial link thing and then download to your pc the directory of stuff that you use with this tutorial he tells you how to do this at the beginning so you could just start watching it and do it that way.
Just a reminder the package he is talking about is NOT on your harddrive at the location he shows you that is his pc\harddrive you must or should Stop the video, click on the link for the package which is at youtube where this video is at, and download this package to YOUR pc and then open it up or in other words access this package from the location YOU downloaded it to on YOUR pc.