There are many ways to do forex scalping.
Keep this in mind different pairs have different personalities.
EURUSD behaves very differently from GBPUSD.
GBPUSD behaves very differently from USDJPY.
So a scalping strategy that works for EURUSD may not produce good results with GBPUSD.
I have posted a number of videos in this post that explain best forex scalping strategies.
You can also develop your own forex scalping strategy.
Making 20-50 pips daily with forex scalping can be a good idea.
Avoid over trading as it will tire you and you will start losing.
Fixing a target something like 20-50 pips daily will help avoid over trading.