Buy the following:
1 25foot roll of romex 12-2awg wire
2 or 3 (your choice) 20 amp outlets back feed design
2 or 3 Outlet boxes (Get the Heavy duty HPDE plastic one, there more fire resistant)
2 or 3 20 Amp Breakers (MAke sure to get the same brand as your main power supply)
Directions:
1. Tap in where you want you outlets to go, and install the Recep Boxes.
2. Cut out the appropiate length of wire you need for each outlet PLUS like 5 or so feet.
3. Turn off Main Breaker Dissconect.
4. Test adjacent outlets arounf to make sure there is no power coming from main.
5. Knock out a Knock out, or go through a already open one.
6. Feed wire into main box.
7. Split wire into its three wires and strip back to where the wire goes into box.
8. Leave the wire hanging
9. Run the wire over, under, through whatever to your recep box and feed into it.
10. connect wire to your recep and install recep into its outlet box.
11.Connect Main side wires to you new breaker. and to the appropiate bus bars.
12. carefully connect you breaker to your main panel.
13. Pull all extra wire taught, and secure with electrical wire staples every 4 feet or less
14. Knock out new spaces in the main box panel for the new breakers.
15.Turn back on main breakers.
16. TEST new outlet(s) with a outlet tester.
Tidy up, and put a cover on the outlets.
also a few of these may be done in a slightly different order like pull the wire taught, then staple then sut excess, the strip then attach to new breaker, then connect breaker.
You will figure out your appropiate strategy.