I will third this with a caveat that MOST trainers are either incompetent or don't care. But you will literally save years of wasted time and injury if you do it right from the start. Just find the right person or cross-check with multiple. There is also a program called "5x5" which is ok for beginners. Don't forget to do pull ups and crunches too. The whole "liftings works your abs" enough thing is a myth. Maybe some cardio too.