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NOC 0601?

>> http://www5.hrsdc.gc.ca/NOC/English/NOC/2011/Profile.aspx?val=0&val1=0601

or 0621?

>> http://www5.hrsdc.gc.ca/NOC/English/NOC/2011/Profile.aspx?val=0&val1=0621



Check what duties are closest to yours.
 
Sounds good. Some of the duties you mentioned match 0601, too. But since both
NOCs are skilled that shouldn't be a problem.
Make sure there's no NOC out there that matches your duties which is not skilled and therefore
not eligible for CEC.
 
The NOC will depend a bit on what you are selling, and to whom you are selling (retail, wholesale).