A CPL alone (you are not that "employable" without an IR as well) will allow you to fly as a First Officer on anything subject to type rating, but only COMMAND an aircraft under 5700kg (for the purposes of Public Transport).
The ATPL lifts this last restriction.
We all start with CPLs anyway, and the ATPL follows in due course once you have bagged 1500 hours, all this is assuming you've sat and passed the ATPL papers.
Don't get any ideas about sitting the CPL only papers, the ATPLs aren't much more taxing and open up much more possibilities with your future career.
Good luck either way.