Computer Room Design

I want to get a software program that will let me design my own house with furniture and all so i can determine how much space i want in each room. And i also want to design the outside of the house like patio,pool and pool house to determine how much land i will need. But most important I want a big attic and basement.

I am in my early teenage years and I need a new bedroom look. I have a big bedroom and need some good ideas on a theme. Does anyone have some suggestions for me. Please do tell. Thanks.

I am planning to construct a house and i want to design the same as per my aspirations.