When do I get my first direct deposit from the air force.?

If I was to walk into the air force recruiting office tomorrow and sign up and get into basic in 4 months (unlikely I know) when would I see my first check? in case it helps or is of some importance in my pay i am married with no kids. In case it makes a difference I am married with no kids. I know I cant spend it cause i will be in basic but my wife will really need the income.