Here is an example of how to move targets from Right to left

Hope this helps, Keep at it your doing great

Program MoveTargetsExample

      Define Tlist As SpriteList

      Method Main()

            CreateTargets(20)

            While Not IsKeyDown("Escape")

                  MoveTargets(Tlist)

            End While

      End Method

      Method MoveTargets(Targets As SpriteList)      

            Define I As Integer

            // loop through the Target List and move each target

            For i = 1 To Tlist.Count

                  //Ramdomly pick target to move

                  If Random(1,2) = 1 Then

                        // Move targets a random amount each time,

                        // multiple the X axis by -1 To make it a negitive number so that it

                        // moves to the left

                        Tlist.Item(i).MoveTo( Tlist.Item(i).X + Random(1,2) * -1, Tlist.Item(i).Y)       

                  End If     

                  delay(.9)

            Next 

      End Method

      Method PositionTarget( Target As Sprite)

            Target.MoveTo( 460, Random( 50, ScreenHeight() - 50 ) )

      End Method

      Method CreateTargets( NumberOfTargets As Integer )

            Define I As Integer

            For i = 1 To NumberOfTargets

                  Define target As Sprite = LoadSprite( "Target" + I, "car1.gif" )

                  target.Visible = True

                  target.FlipHorizontal()

                  PositionTarget( target )

                  Tlist.Add( target )

            Next

      End Method

End Program

Thanks for the question, keep at it and have fun