NOC system is available online. Everyone here will advise you to check it yourself and make a suitable choice based upon what is a close match to the actual duties performed and which can be corroborated by s reference letter. I've suggested some NOCs you may want to investigate further. There are various options available which msy be more suitable, go by the duties and nit job title. Again, for the purposes of skilled immigration, budiness ownership is irrelevant- you need to consider yourself as a consultant or freelancer. best of luck.