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If the breaker in the room is the only one on the circuit you could put more receptacles on it. If not you might want to put an entirely new circuit in the room. If youa re going to use the existing circuit splice off the existing circuit with pigtails in the electrical box. If you are going to surface run the additional wiresThey will need to be in conduit or "bx" for mechanical protection. at each entry/exit from an electrical box you will need an approriate clamp for the type of box and conduit you choose. If you are running the cables concealed it would probably be easiest to put a drop out of each box to the underside of the house. then you would have no drywall cutting to do. Go to homedepot or someplace liek that and tell the electrical guy what you want to do. They should set you up with all the connectors/clamps/boxes/marrets/wire etc. that you will need. Pay attention to how much load you are putting on any one circuit. A 15 amp circuit can only be loaded to 80% or about 1440watts. It will take more before tripping but that is all the code will allow us to design to. You can get the loads of almost all electrical devices from the back somewhere. For example my monitor uses 2.0A at 120V that is 240W. My computer runs 1A or 120watts. any desk lighting load can be calculated using the lamp wattage. Add up all your loads to determine if you need anothe circuit.
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