How do you rid your yard of the little green and brown stickers ?

Sounds like sand burrs. If your yard is completely infested and you have little or no grass, it might be simplest to kill the whole yard - either with general vegetation killer like Round Up, or by smothering it with layers of dirt, manure, newspaper layers, old carpet, whatever it takes to kill it, then start over.

Where you don't have a heavy infestation (yet), you can either spot-spray with weed killer, or, if you don't want to use poison, get out there with the weeder and pull each one of them. (Hacking them off at the ground will probably only cause them to spread. If it's a thick root and you can't get it all, maybe some vinegar or boiling water poured on each root will discourage it.) Best of luck!

Try Scotts Weed &Feed