Ok,
Thnx to Krane I found this:
1:
sighttrace( Vector start, Vector end, [ Integer pass_entities ], [ Vector mins ], [ Vector maxs ] )
Performs a trace line from the start to the end, returns 0 if something was hit and 1 otherwise
2:
trace( Vector start, Vector end, [ Integer pass_entities ], [ Vector mins ], [ Vector maxs ] )
Performs a Trace Line from the start to the end, returns the end or the position it hit at
3:
tracerfrequency( Integer frequenct )
Set the frequency of making tracers
But I'm not sure how to use this.

My first time that I'm making a mod
Can someone plz help me to make?
Thnx