E46 Beemer

Fuse to starter ok? Relay? You could give the starter 12V from the battery just to rule out the starter. If your startet doesent turn when you give it power you could go over wires connected to it.

You could get someone to help you push the car and release the clutch in 1 or 2 Gear. If its a Manual drive car. Not shure but as far as i understanded your battery is in the trunk