my windows not working

hi im new to this and new to bmw never had one befor .my windows are not work i have a 318i 4 door but only front windows are electric ,now where to start ,only had the car 2 weeks .got the car noing the windows were not working but the gut said it was the fuse and it holding needed to be fixed ,not a prob ,yer right ,there is i think no fuse no holding and no loose wires in the fuse box (i got the lid of dont ask how )so i need to no what fuse number is it for the windows , i think its 14 . or can anyoe tell me how much they think it will cost to fix ,need my window open summers coming .