Hi i am new here as you can see

I have a few problems with my rover 600si petrol car.(sorry if it is the wrong thread as i couldn't find the right one)
When i park up the car rolls down the street.The hand brake is on too
I have a door open light on which i cant get off and yes the doors are closed lol.
Hope someone could help me out as to what these problems might be and how much it is likely to cost for repairs.
Thanks Lorraine
