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 :
Holiday Matsuri (FL)
Upcoming costumes : Suzie Q from JoJo's Bizarre Adventure, Edea Lee (various versions) from Bravely Default, Robotnik (genderbend) from Sonic, and more!