V2+15 is when you can start retracting flaps on schedule.
For approach, on the - 300/-500 you set Vref+15 and on the -400 it's Vref+20. Half steady headwind components+full gust factor shall not exceed Vref+20 or Vfe-5 knots. I only fly the -400, I don't remember about the smaller versions. On the -800 it's Vref+15.
Limit your bank angle to 15 degrees at or below V2+15 knots. The FCTM has all the info you need.