I just moved into a moble home and I turned the furnace on and it was working fine. But when it ran out I turned it.off but when they filled it I turned it on and now it is only blowing cold air. I see not pilot light no flashing red or green light and the valve outside is on. I have three small kids and I have.spent enough money on oil. Its cold and I stay cold as it iss so I like heat, I work third shift so when I get home id like to have a warm house but don't know what to do, and my boy friend doesn't know anything like that and he thinks ghe can fix anything but he cant. I need help please

Chances are that if you ran out of oil, the furnace needs to be re lit. Look for lighting instructions. If you do not see any instructions on the outside open the front cover and look inside. May be as simple as pressing a reset button.