Is there a program where i can create a virtual room or something, before i do it for real?

Question

To see how a room would look before i actually paint/decorate it.

Answer 1

go to dressupgames.com

click on "rooms" as one of the left hand links.

then it will give you a ton of room decorating websites, some are kiddish and for fun, but some are professional, like ikea.  

Answer 2

bhg.com(better homes and gardens) has design a room