Good start.... changing the back ground is pretty easy.... go to view on the left side of you view panel> select camera> hit control A> in the channel box on the right, scroll down till you see enviroment. Then you will see a color bar you can change by double clicking on it.
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb