Here's my advice
Color: Blue, grey, or, if you can pull it off, black
Material: Always go with wool.
Buttons: Two is fine, three is fine, anything more is ridiculous. Some people can pull off a double breasted look, some cannot. If you aren't sure, don't try.
And for other things, don't wear your airplane tie, or your tie with little pigs flying, or whatever. Be safe and boring.
And this is not the time to try out the cool striped shirt that you got at Metrosexuals R' Us. Stick with something safe and boring.