I agree, Journeyman would be a good place for you. You have the experience of crafting costumes, but just not the experience with competing. A lot of cosplayers start competing really soon after they start making costumes - myself included - so it's a bit different for them.
2014 - Upcoming Conventions :
Anime Weekend Atlanta (GA)
Upcoming costumes : Princess Garnet (coronation gown) from FFIX, Edea Lee (various costmes) from Bravely Default, and more!