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 Conventions :
Katsucon (Washington, DC) - Megacon (FL) - Colossalcon (OH) - Anime Weekend Atlanta (GA)
Upcoming costumes : Yuffie from Kingdom Hearts, Princess Garnet (coronation gown) from FFIX, and more!