I think everybody covered everything I would say. As far as looking outside. Pick a point on the aircraft relative to the horizon that keeps you at altitude when doing your turn. It's different for everybody, and may differ slightly for each aircraft. Things I like to use are rivets on the cowl, the prop spinner, the corner of the cowl, bolts on the glareshield, compass, etc. Find this point, but remember to keep your eyes moving. 90% outside, 10% inside. You should come inside fast enough to check your altitude, coordination and bank.

If you set the seat up the same way every time (which you should take a minute before start to do every time) and find a spot for the left turn, and a spot for the right turn it will be the same every time. The advantage to looking outside can not be understated. You'll see the trend change much faster.