First things first, make sure you get someone you trust and are confident with to provide a 100% diagnosis of both problems - at least that way you can be reasonably sure of what the approx repair costs will be before you spend or do anything.
If the clutch has dropped to the floor, then you could well be right about the slave, but check for fluid leaks from the bottom of the bellhousing first, if clean then move back along the pipework to the master, checking the level.
The coolant leak could be many things, a chaffed pipe, rad cap, radiator, etc. What's the mileage, have the belts and waterpump been done before ? If they have been done in the last few years, then your leak may well be elsewhere ?
Good luck solving the issues
