I'll go one step farther than the others. In addition to scripting everything out and then running a restore, I'd get the scripts into some sort of source control so that you have the ability to manage this stuff over time, automate it further, etc.

You also might want to look at third party tools such as Red Gate SQL Compare. You can then compare structures between two databases, identify the differences and generate scripts from there.

DISCLAIMER: I work for Red Gate.