From Google..
"When the U.S. flag and state flag are flown from a single flagstaff, the U. S. flag should be displayed from the peak position with the state flag immediately below it. The state flag should be approximately the same size as, but never larger than, the U.S. flag.
When the state flag and the U.S. flag are displayed on separate flagpoles, the flagpoles should be of equal height and the state flag should be approximately the same size as, but never larger than, the U.S. flag. The U.S. flag should be flown from the position of honor on the flag's own right, or from the flagpole on the left as normally viewed by the observer. The state flag should be flown from the second position of honor, or from the flagpole on the right as normally viewed by the observer."
I knew about flying the US flag higher than the state flag, and that the state flag can't be bigger, but didn't know it mattered what side the flag should be on with separate flagpoles. Learn something new every day I suppose..!