M.B.
1) Since both of you live in the State of Virginia you will have to be seperated for an entire year before you can file for divorce.
2) He's active duty. You have the legal office like the other woman said, you also have fleet and family support, and you also have his chain of command. I don't always recommend going to his command, but since you are sure you want a divorce - why not, right?
3) If you have been working durring the marriage, and how long you two have been married while he has been in the Navy, and his rank will determine your child suuport, etc. (example - you two got married and worked up until a year ago - the court could say well you didn't have a problem working then you won't have a problem now) Someone that hasn't worked in years and has got accustom to being a stay at home mom will most likely be awarded more money than a wife that has worked.
4) If you are living in base housing they can tell you to get out. The military can make him leave until you have found a new place, but you will not be able to stay there for every long.
Best advice go on base and start talking to who ever you can. I've been a Navy wife for a while now, and have been in that position. Thankfully we were able to work things out, but you could always stay married, get the benefits of the military: NEX, commissary, and medical. Still take most of his money, work if you want, kick him out and tell him to move in with a friend, and have the comfort of knowing that the most expensive things are taken care of for BOTH OF YOU not just your daughter.