The very first thing you need is either a new battery or to recharge that one if it is still good. Letting batteries discharge is bad for them and will kill them (unless it is a deep cycle, even then leaving them discharged is not good).
You didn't give enough details, what kind of car, engine, induction, etc...
I will assume it is a carb, if so did you drain the float bowls before storing it? Was it stored indoors or outside? It doesn't take gas very long to go bad or to gum up the carb. How long was the car sitting? Is it a mechanical water pump? (belt driven?). If it is a mechanical pump I doubt it went bad, you need to let the car run long enough to build enough heat for the thermostat to open, you will not see any flow in your radiator until the thermostat opens. If the engine is getting hot and there still is no flow, your thermostat could be stuck closed.
You should really change the engine oil as well if it has been sitting for a long time, I take it you live in a cold climate, so there is a good chance you have moisture in your oil from sitting. This would not effect your starting but, it is something you should do.
Moisture in the gas is another story and could cause stalling and hard starting.