Anzani Racer,
It's great that you have identified the space, but you need to take some time and examine the other questions that need to be answered, such as:
- What do you want to accomplish in your space?
- Are you going for a retro look, a modern look, or a mix of the two?
- What type of locomotive power and rolling stock do you want to run? (This will determine your minimum curve requirement.)
- Do you want a couple of simple loops or a layout with lots of sidings and industries?
- Have you given thought to the accessories that you want to put on your railroad?
- Have you decided on a track system?
- How many levels of track do you want?
- Are you going command or conventional control?
- Have you ever built a permanent layout before?
- Have you considered building a smaller layout in order to become familiar with taking on a larger endeavor?
- Will your benchwork be L-girder or open frame?
- After the baby is born, how much time will be available to maintain the layout?
- Will the layout be kid friendly?
Like I said, you will want to take a moment to think about the layout. The more planning you do now, the less headache you will have later.