Calculate the amperage rating for the total load you need from the outlet. Amperage rating can be easily calculated by the formula P=VI. The variable "P" represents the power in watts and "V" represents the voltage. Select the 14-2 cable if the amperage rating is up to 15 amperes. If rating is up to 20 amperes, then select 12-2 Romex cable. Most home outlets are generally wired with 14-2 Romex cable.
Inspect your already-installed breaker panel before running a new cable. Remove the door of your control panel and look inside at the bussing. Make sure you have enough space to install new breakers (single pole or double pole as per the requirements).
Select circuit breaker according to the load requirement. There are two types of circuit breakers, single pole and double pole. If you are using 110 V ac, then select single pole breaker. A double pole breaker will be used for 220V ac.
Route the Romex cable from the panel to the outlet. Strip off the outer jacket from the end of the cable using a sharp knife. Strip about 8 inches of the jacket.
Connect the black wire of the cable to the positive connector/gold screw of the outlet and the white wire of the cable to the negative connector/silver screw of the load. Connect the bare copper wire to the green screw of the outlet.
Connect the black wire of the cable to the new breaker output connector. Check different buses installed in the breaker panel. There must be different buses in your breaker panel. One bus should have a similar kind of breakers to which you are going to install. Switch off the main power of your control panel. Affix the new breaker on this bus firmly. A bus must have all the white wires connected, hence connect your white wire to this bus. All the bare copper wire must be connected to other bus or the same bus, so connect the bare copper wire accordingly, following the previous step.
Close the door of main panel back after rechecking the newly installed breaker firmness at the slot. Switch the power on. Your circuit is ready to work.