How to check for errors in TSQL

Hi, I am not very comfortable with TSQl, I need help with the code below:

This procudure:

 drops and recreates table BlankData if table exists; creates it anew otherwise.
--.                 -.  loads all xml documents in directory specified by @path into BlankData.

Now I want the proc to:

-.  add checks for the following conditions, with suitable messages
1         -.  failed "exec xp_cmdshell @cmd" command
2      -.  @path's referencing a directory that's devoid of .xml files
3       -.  failed attempts to read .xml files
4       -.  failed "select name from #filenames where name like '%.xml'" command
5     -.  failed "exec (@sql)" command6          - collapse all sp_Load<documentXX>toDB procedures to a single  parameterized procedure

 7             - add a second parameter that:
               specifies qualifying name of table from which to load documents
              defaults to value given by a new"current epoch" function

The  concern here is supporting multi-schema operation by allowing for extraction of different versions of control    supporting choice documents (for different schema versions) from different tables in a set of related tables:  The Proc

CREATE PROCEDURE [dbo].[LoadComplexChoiceValuesToDB] 
    @path varchar(256)
AS
BEGIN

    -- To allow advanced options to be changed.
    EXEC sp_configure 'show advanced options', 1
    
    -- To update the currently configured value for advanced options.
    RECONFIGURE
    
    -- To enable the feature.
    EXEC sp_configure 'xp_cmdshell', 1
    
    -- To update the currently configured value for this feature.
    RECONFIGURE
    

    SET NOCOUNT ON;
    IF (EXISTS (SELECT * 
                 FROM INFORMATION_SCHEMA.TABLES 
                 WHERE TABLE_SCHEMA = 'dbo' 
                 AND  TABLE_NAME = 'ComplexChoiceValues'))
    BEGIN
        print('exist')
         drop table fas.dbo.[ComplexChoiceValues]
    END
    
    
    create table ComplexChoiceValues(id int identity(1,1),fileName varchar(256),complexChoiceFile xml)
    
    declare @cmd varchar(256)
     set @cmd = 'dir /b ' +'"'+ @path+'"'
    create table #filenames(name varchar(256))
    
    insert into #filenames 
    exec xp_cmdshell @cmd

    declare @file nvarchar(256)
    
    declare fileNameCursor CURSOR SCROLL FOR
    select name from #filenames where name like '%.xml'
    
    open fileNameCursor
    fetch next from fileNameCursor
    into @file
    
    WHILE @@FETCH_STATUS = 0
    
    begin
        declare @sql varchar(max)
        
        --insert into fas.dbo.SampleData(fileName) values (@file)
        
        set @sql = 
        'insert into [fas].[dbo].[ComplexChoiceValues]
        select '''+@file+''', * from openrowset (BULK N'''+@path+'\'+@file+''', SINGLE_BLOB) as xmlfile'
        
        
        exec (@sql)
        

        FETCH NEXT FROM fileNameCursor
        INTO @file
        
    end
    
    CLOSE fileNameCursor
    DEALLOCATE fileNameCursor
    
    DECLARE @fileCount int
    select @fileCount = COUNT(*) from #filenames
    print ('There are '+ convert(varchar(max),(@fileCount-1)) + ' files under the directory')
    select @fileCount = COUNT(*) from BlankData
    print (convert(varchar(max),@fileCount) +' xml files are imported')
    
    select name as 'File Not Imported'
    from #filenames
    where name not in 
        (select fileName from fas.dbo.BlankData)
        
    select fileName as 'File Imported'
    from BlankData
    
END
GO