Hello and welcome to the board. I am Jenny and my husband is AD Navy.
Jenna gave you the best advice as far as the finances and support. Never feel like you can not ask for help and always know everything and have all access to your bills, accounts or whatever. I believe the AF will help him get the power of attorney when he goes to bootcamp but do double check on that. You just never know what might come up when he is gone and that little piece of paper gives you the authority to handle it.
As far as your son is concerned I give the same advice to all new military families. If you keep things as stable and normal as possible your son will be ok. He will ask about daddy and you should talk about him often. There are a number of things you can do to keep that connection. One of my favorites is a video of daddy reading some of his books to him. The big thing is how you handle things. If you are always stressed and upset he is going to pick up on that. Children are not really all that complicated when they are small. If their needs are met and they feel safe and loved then they know things are ok.
Finally, jump in here often and hang out with us. This is a very supportive group and a lot of fun.