Cleaning up table

Hi,

Recently, I am trying to remove millions of records from  a table using "delete from table" statement .  The process is almost done, the daily export backup file looks much smaller.  But when I looked at the tabespace , it does not seem to have space back.  I believe I must have missed something.  After researching, I believe I need to do the following and would like to hear your comments and suggestions of their pros and cons or order in executiing.

alter table xxx dellocate unused;

alter tablesapce xxx coalesce;

alter  xxxindex deallocate unused;

Thank you!

Martin