How the heck can I know what God wants me to do?

On our journey toward whatever it is God is going to have us do here we have been fortunate enough to find some signs along the way to reassure us we are moving in the right direction. These signs have always come much later than I would have liked to see them. It would be nice if God would show me what he wants me to do and then I could go do it, but He doesn't seem to work that way. He always makes me make decisions and then about 5 miles down the road when I am feeling sufficiently confused about where I am and what I am doing he sends me a subtle sign that seems to say "Yep, you are doing great, keep going." I was starting to get depressed about job situations here a week or two ago. So he sends me another sign this week. I got a call from a local law enforcement agency asking for an interview. The next day I let my boss at Napa know that he may be getting a call as a work reference. Later that day I gave him a ride to the shop where his truck was getting worked on and he asked why I was going back into law enforcement and subtly hinted that there could be higher up positions available as soon as they purchase other businesses. I thanked him as I let him off and realized I was at another juncture. Which future did God want me to choose? Does he care? Does it matter?
I feel compelled to try this bi-vocational ministry idea (Bi-vocational ministry = working a fulltime job to support my family thus freeing the church from that burden). That being the case I see both of these job opportunities as being capable of helping me toward that goal. But what happens when I have to choose between the two?