I went to the sand people base before I got the robot, and now I can't get back in, is there any way I can get in, and possibly even get light points?

Sorry, you can't. In the future, save your game right before you go into new places, like the enclave, so if it doesn't turn out right, you can restart and fix it. I did the same thing the first time. Luckily, I saved it so I reloaded, returned to the Hawk and got the robot. Don't worry, just wipe out the Sand People and be done with it. There are plenty of more opportunities to earn Light Points in the future. I got to the top light side with ease on the next 2 worlds, with plenty of opportunties to spare.

Is there a way to kill the sand people quickly? cause I have tried that too, but I can't get it.:jawa