What materials do we need to run gas line to laundry room?
My last house had gas plumbing where the homeowner ran a new line from the water heater line to the laundry room. It was red-tagged as unsafe.

I strongly recommend that you hire out this job; it's one of those "if you have to ask, you shouldn't be doing it" situations. Gas plumbing isn't one of those things that you can mess up and then fix later without any danger or problems.