basically the shoot that protrudes is going to be the root but the natural order is for it to come out the soil and go back in before the other end comes out and casts the remaining seed away with its leaves.
use the paper towel method;
1) take a few paper towels and put them on plate. soak with distilled water. put seeds on, then put a couple more towels over and wet if necsesary. ( there shouldnt be a puddle of water, just soak the towels!). next cover the plate and put it in a warm dark place for 24 hours.
2) check the seeds at 24 hours. remove any that have sprouted and plant them shoot up. redamp the paper if needed and check remaining seeds every 8 hours or so.