A clogged toilet is a common occurrence in residential properties. Fortunately, you can normally resolve the issue with a standard plunger. If you don't have one, you can purchase one at most big box chains and hardware stores. Be careful not to flush the toilet until the water has drained from the basin, or you could cause the tank to overflow.
If you don't have hot water, there is likely a problem with the settings on your hot water heater. Check your settings and verify that everything looks accurate. If your water heater is gas-powered, verify that the pilot light is lit.
If you make any changes to the system, wait 15 to 20 minutes before testing again.