1. Yes, but wifi tech has come along way since 2007, newer airports will be much faster with the new Mac Mini's
2. You configured your Express from your Macbook, but the Express retains all of it's data. All you will need to do is find your network (i.e. the express's network) from the Wifi icon in the top right hand corner and then it will ask you for your password and you just plop that in.