If he's never climbed before he needs to go with someone who knows what they're doing. Especially if he's not even done little ones like St Helens or Ellinor. He needs to start looking into cascadeclimbers.com or www.summitpost.org and find a group to go with, people are always on there looking for partners. Ice axe, Crampons and Helmet forsure. But this is my opinion and I'm not an expert. I've seen idiots go up to 9,000" in jeans and shoes with no pack or jacket, and then you have a lot of experts who have died recently around here, doing what they do. Alot can go wrong, and you can have no control of it.
This photo was taken 28 Feb just below Camp Muir , about 10 minutes later a huge avalanche happened right next to us on the Nisqually Glacier (we were on the Muir Snowfield). I've gone out there when it's sunny, only to have a blizzard happen 30 minutes in. Be prepared is all I can say.