Since you have only 20 stored procs, I would run them manually, one at time, making sure that there are no error messages as you create each stored proc.
If you do want to run them all together, if the scripts are in one file, you can separate the creation script for each with a batch separator (GO) and then run them all at once.
create procedure dbo.Proc1
create procedure dbo.Proc2
If the scripts are in separate files, you can create a command file that calls the SQLCMD utility to execute each file. You can also do a similar thing using a powershell script and SQLCMD or Invoke-SqlCmd.
But, to reiterate what I initially said: I would take 20 minutes and run them one at a time because it is easier to catch any errors/warnings when you are creating the stored procedures rather than trying to debug later.