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There is only the one bolt in the center that fastens the harmonic balancer into place. Check you owner’s manual or service guide for proper torque specifications. Replace the bolts that fasten the water pump to the engine block. If you removed heater hoses from your water pump, you will need to slide them back onto the water pump. Once the hose is on the pump you can squeeze down the hose clamp with pliers and slide it up over where the hose and pump connect.  If the clamp has a tightening screw, tighten it with a screwdriver. This will secure the hose to the pump. If the lower radiator hose is still removed or if you removed the upper hose for any reason, put them back on the radiator now. Once the hose has been slid onto the radiator, use a pair of pliers to move the clamps up the hose to the place where the hose and the radiator meet. This will fasten the hose to the radiator. If your coolant looks dirty or if it has been more than a year since you last changed the coolant in your vehicle, use new coolant. Dilute the coolant as specified in your owner’s manual or service guide and fill to the mark that says “cool” or “cold” on the tank. If your coolant is clean and relatively new, you can pour the old coolant back into your radiator. You should use the routing diagram stamped on your hood or printed in your owner’s manual to make sure that the belt is run properly.  Pulleys with grooves are intended to meet the grooved side of the belt, but some flat pulleys are meant to be driven by the flat backside of the belt. This can be done by releasing the tensioner in a serpentine design.  If you are working with a V-belt design then you will need to tension the belt manually. A good rule of thumb is that the belt should have a maximum of 1⁄2 inch (1.3 cm) of movement in the middle of the belt's longest run. Check your vehicle manual for more information. If in doubt, consult a mechanic. You do not want to start your engine without all of the appropriate accessories hooked up. Take a second look over everything and make sure that all is well before moving on.

Summary:
Bolt on the harmonic balancer. Reinstall the water pump. Attach the heater hoses to the water pump. Replace the radiator hoses. Fill the radiator with coolant according to specifications. Rerun the drive belt(s). Tighten the belt. Check one last time to make sure all belts and hoses are connected.