The very best advice I've received so far (and I'm sure there will be more to come) was to make sure and have your recruit call from the airport in Chicago before he has to turn in his phone.
When he was on the plane, I sent him a text telling him I miss him and I'm proud. You know, all those encouraging words. I also reminded him to call me when he arrives... and before he arrives. I texted that his big brother tells me that he will be the one to get the first phone call.