Setting/declaring Variables Plus Concatenation

So I know my code is pretty far off on the variables, but I couldn't find info on how to do this anywhere. Do I need to use sub selects to set the variables? Or something other than variables?


DECLARE@Prefix VARCHAR(10),
@First_Name VARCHAR(50),
@Middle_Name VARCHAR(50),
@Last_Name VARCHAR(50),
@Suffix VARCHAR (10),
@Title VARCHAR (50);

SET@Prefix = ind_prf_code;
SET@First_Name = ind_first_name;
SET@Middle_Name = ind_mid_name;
SET@Last_Name = ind_last_name;
SET@Suffix = ind_sfx_code;
SET@Title = cst_title_dn;

select coalesce((@Prefix + ' '),'') +
ltrim(rtrim(@First_Name)) +
case when ltrim(rtrim(@Middle_Name)) = '' then ' ' else (' ' +
ltrim(rtrim(@Middle_Name)) + ' ') end +
ltrim(rtrim(@Last_Name)) +
coalesce(' ' + @Suffix, '') +
char(13) +
ltrim(rtrim(@Title)) +
char(13) as label

from co_individual (nolock)
join dbo.co_customer (nolock)
on cst_key = ind_cst_key

Thanks!