With out knowing where the coolant leak is coming from, we can't really estimate the repair. It could be anything from a radiator cap, a head gasket or the radiator it self. That is a range from $15 - $2500 or more. So have your Dad locate the leak and then we will be happy to estimate the repair.
The belt is about $100. What is the problem with your steering pump, maybe it is just the reservoir? Because the whole pump installed can run several hundred.
Let us know where the leak is and a bit more about the power steering pump and we will go from there.