Know how to repair common home plumbing problems yourself
how to cut the water off
You can first to find the water meter. Usually, the meter is housed in the ground and has a large manhole cover. You can use a wrench or other tools to turn the nut on the meter. Otherwise, a cut off valve may under the home, close to the water hose connection. Look around the back door or on the front of the home close to the end. Lastly, there may be a cut off valve at the water heater.
It most likely for toilet leaks. Check the tank for issues. If water draining down the overflow tube while the tank is full, it means the fill valve is not working properly. Check the chain to make sure it is straight and not hooked to anything. Check the flapper seal as well. They are wear out and get warped.
low or no water pressure
The first possibility may be the faucet aerator which could need a good cleaning or to be replaced. Second to replace the pressure reducing valve. Additionally, lime, rust and scale buildup stuck in galvanized pipes (if you have) could be causing the low pressure.