if you only have the command pod left, and no fuel tanks, you`re out of luck. even if you have rcs thrusters (what i think you mean, could be wrong), you don`t have any fuel to use them. i suggest ending flight and restarting. when you look at the map, at some point during your mun approach the path should switch. when that happens, turn your rocket around to burn retro grade (i`m going to assume you know how) and slow your speed down. i recommend 100 meters a second, and just burn every once in a while to that point. when you get to around 7500 meters slow down to 50m/s. and when the altimeter gets to 5000m, press c to get cockpit view and use the radio altimeter, and try to cancel out as much horizontal velocity as possible to the retrograde marker in the center of the blue half of the nav ball. as you get closer to the ground, try to keep you speed under 10m/s for landing. also, make sure you arent wasting fuel. you want to have enough to be able to get back. hope this helps.