How can I extend my 3-month Non B visa to a one-year visa in Thailand while employing Thai nationals?

Right, I need some help! I recently set up my own counselling business/company in Phuket. So far so good. I got my 3 month Non B visa and my work permit for one year. My question is about extending this 3 month visa to a one year visa. I understand that I will need to employ a further 3 Thai people for this - any ideas? Also how do I go about extending the visa? Will I still need to leave the country every three months? Thank you