I think I could do it! But need some help!

I love Myst and I have always wanted to make my own ages. After I saw this...where people could make ages with Blender. I was excited! I think I could do it. We'll at least build the world in Blender. But I couldn't do anything else. What I'm trying to ask is do you have to make an ".exe" of your age and post it on the forums? What do you do when your done making the map? Help me out guys...I got some cool map ideas!