What a great gift you got for him!! A variety of juices would probably be a big bonus for him - even if most of them are tobacco flavors. A lot of the fun of vaping is trying different flavors.
My advice would be to tell him to take long, slow drags...to fill his mouth with vapor before inhaling. Also, tell him not to give up if he feels like it isn't working. The best thing to do is to give it a chance. Even if he still smokes for awhile, every cigarette he doesn't have is a good thing. If every time he wants a cigarette he'll vape first, he might cut down on a lot of the cigarettes. If after vaping for awhile he still wants a cigarette, he can have one. That alone might help him not be anxious about it. If he just relaxes and gives the eGo a try, he'll soon be vaping more than he is smoking without working too hard at it and would probably completely replace the cigarettes with the eGo. He doesn't have to push himself at all. And he might even find (like I did) that he loves vaping more than smoking and he'll make the switch quickly. But he needs to know that he doesn't have to.
I smoked for 34 years and didn't have any problems whatsoever switching over...some people have taken longer. But from what I've seen, most people do eventually make the switch. There are quite a few of us here that have smoked for more than 20 years, so he would be in good company if he'd join the forum. We'll give him all the encouragement he could ever ask for. Let him know that we all wish him the best of luck and would love to have him here.