mfirst;
The links above are good suggestions. I note that you also posted here the possibilities regarding " Universal remotes. " From my own personal experience, Logitech rated very poorly, despite the sales spin. ( They do make good keyboards though ).
Many members here are adamant about the benefits of using Airport Express, Itunes, MAC, and Apple. Before you go out and purchase anything more, it might be helpful to know what equipment you have currently in your collection.
I use both MAC and PC for work, but have no experience with Airport Express. I never thought I would ever need, or use an MP3 player, but now I have a Beosound 6 to use while driving, and move music around on other systems with an AUX port. I keep it to like products, and software, as it just works better, and lasts longer. I'm happy to keep it 100 % B&O.
Ultimately though, it is your system, & your choice. Experiment a little.