Lower back pain, pain runs down leg if i stand to long on right leg starts to hurt?

You likely have pinched nerve syndrome (lumbar radiculopathy). You need to see a doctor for a complete evaluation and advice. Good news for you that lower back exercise will help.

Agree with Dr Le, and a visit to your doctor should allow exam and decisions regarding imaging. You describe a radiculopathy which is customarily caused by nerve compression in lower back but could be referred pain due to a more peripheral source, such as piriformis syndrome. If images are not definitive, an EMG might be useful.