Correct procedure is to extend gear and full flaps at 250kts.
1. Different people use different throttle techniques. More movement, less movement, "walking throttles"... you will find your own method.
2. In visual traffic pattern you adjust bank angle by watching runway. There's no one single bank angle value that will give you ideal lineup in final. So, the scan pattern is: check runway > check AoA > adjust bank angle > repeat
You can see here scan pattern - he moves his head every few seconds to estimate relative position then turns to HUD to observe parameters.