The Kingdom of God

What is that really? In the context of "Seek ye first the kingdom of God, and all these things shall be added unto you." What does that mean exactly?? When you're faced with tithing, feeding your family, or paying your bills.. It seems like tithing doesn't seem as important as the rest.. That's with the assumption that the "seek ye first" reference is concerning that.. If it is then we should tithe first, then do the rest.. I've never seen in the bible where it says, pay your bills first, then tithe.. Even though when it comes to eating or paying bills, bills seem to be first. I can live without, cable tv, internet, phone, unfortunately some in my household can't. So the bills get paid, then we eat, then if there is any left, we tithe. Sad isn't it?