Don't know anything about the use of redstone and pistons? Well let me help you...
so when 1.7 came out, I started working with pistons, doing creations and stuff.
here is my previous thread of that map, with download link. CLICK
But I updated that, extended the tunnel and did a whole new thing, which shows examples on how to use an infinite redstone circle.
The updated tunnel: (more stuff closing)
The infinite redstone circle. and some cool stuff with it