Which branch? I'm recently retired Air Force. I can help you with this one, but only to a certain extent. I'm sure you'll want/need the perspective of a military wife. Before anything else, I would suggest that everyone's experience will be different, so get as many opinions as you can. Some will be good, others will be negative, chances are they will all be true.
Please feel free to message me on this question. There are so many things I want to tell you. I think I could write a book on this subject. I'll try to give you some ideas here, but PLEASE, if you really want more information, message me, and I'll write as much as I can.
I don't want this to sound negative, but with that intro, I'm sure it does. As with everything in life there are good and bad sides to it. Don't be discouraged. This can be GREAT!
Bad news first: You are going to spend time away from one another. It's pretty much a given fact that everyone deploys these days. It is just a part of life in the service. You get used to it. No big deal, just don't forget your family and friends if you need some emotional support. Seperation can be a pain in the ass, but you will never be alone.
The good news: I traveled the world while I was in. I got to see and do things that I would never have been able to do otherwise. I've been to so many countries that I need a globe to count them all. She went with me! We had a great time traveling around.
What can you expect? Well, in the immediate future, he's going to be going through a bunch of crap for the next few weeks in Basic. Be supportive and send letters, or email, or whatever method you are allowed to communicate. He's going to be cut off from most everything. That isolatioin is part of the training. Don't get upset if he doesn't call. It's because he can't, not because he doesn't want to. He won't have much time to write a letter either. His every waking moment will be occupied by something else. Just be patient.
I have too much to say, and not enough time or space. I know I haven't told you much here, but I'll be happy to tell you whatever you want to know. I know you don't know me, but I'm not just being polite when I say you are welcome to message me about this. I want to help you as much as I can. The more I know about your particular situation, the more information I can give you. What branch is he in? What job is he going to do? Where is he trying to be stationed? Etc. Etc. The military is enormous, so it is really tough to give you specific answers/advice when I don't really know your situation. If he's Air Force, I can tell you a lot. If he's in another branch, I can only give you general information.
I wish you the best of luck! You are at the beginning of a great adventure.