Few 306 DTurbo problems, HELP

[Haji]

Ive got a 1995 DTurbo 306, love the car to bits but having a few problems..
First of all in the mornings when its the first start of the day my car gives a puff of white smoke and it is also very lumpy until i rev it for some time and until it warms up then no prolems and secondly the mpg is absolutly shiiite.. not actualy worked it out but from £20 i only get like 60 miles.
Hey guys please any advice of how to get it sorted.. your help would very much appreciated.