hi caddy your solution to the problem just lies with simple clicks please follow these simple steps
1.when you start rendering your model using the camera icon select the scene see this is where it is annoying you with that background.
2.now you got options. select the default or whichever suits you as your background but i tend to stick with the default background as it gives you some decent renderings at first go.it's not that i don't use other backgrounds but it depends on the model you are trying to render
3.it's not annoying anymore is it?