Default Option For Stored Procedure With IF - ELSE Condition

I need to set a default for the stored procedure to begin automatically at type if no value is supplied -    Right now you need to specify 0 for the type condition to begin -----    So Basically the default will automatically check the IF(@Type=0) Condition and maybe a 1 or something else will skip that condition Completely - Any help will be appreciated

CREATE PROCEDURE Report].[Report2]
      
      @StartDate datetime,
      @EndDate datetime,
                @Type tinyint
AS

BEGIN

set transaction isolation level read uncommitted;

                declare @Type tinyint
      declare @pStartDate datetime
      declare @pEndDate datetime
      declare @IsMonthlyReport bit
                set @Type =0
      set @pStartDate = @StartDate
      set @pEndDate = @EndDate

      
      
       

      BEGIN TRY

            set @IsMonthlyReport = [CoRegReport].[rpt_IsMonthlyReport] (@pStartDate, @pEndDate)
       
       
       
       IF(@Type= 0)
       BEGIN
   
            
            
            
       IF (@IsMonthlyReport = 0)
            BEGIN