Hey, Does Ram have to be from right to left or left to right?
Either way, it depends on which way you are looking at your motherboard
Seriously, if you have 6 slots, you are likely using DDR3 memory in 3-channel mode. The first three memory sticks would be placed in slots of the same color. However, if you are installing 6 sticks of the same exact specification it doesn't matter what sequence you use.
If you are doing something else, please be more specific.