Welcome Joseph, we're happy to have you on board with us!
A couple of things to help you out with your costume. This is your local 501st chapter and we are here to give you hands on help with your costume search and build. There is also a "Detachment" which deals specifically with Officer costumes, check it out here:
http://www.imperialofficer.com/
That forum is specific to the costume you are referring to and has a ton of great information to help you. One word of advice we give to all new members - once you join the forums especially over there take a few minutes to browse the areas and see if you can find the information you need. For example, to get you started:
The actual "Getting Started" area lol, it has some good tips:
http://www.imperialofficer.com/forum/index.php?/forum/57-getting-started/
Right in that area is the "Resource List" which actually has some options for what you are looking for:
http://www.imperialofficer.com/forum/index.php?/topic/1817-ioc-costume-resource-list/
Like that, lots of great information you just need to take the time to search it out. Once you get an idea of what you need and want we can help let you know if they are reputable or if we've had any personal experience with the vendors or products.
Oh, and I see you got your costume from ebay - we STRONGLY recommend people stay FAR away from purchasing anything on ebay as most of the time it will not be up to standard and is either "recast" or fake or subpar. Do you know who the maker was for your costume? Was it a store or a private seller? And if you want, post a "work in progress" thread where you can share some pictures of what you have so far and this way our Armorer guys can chime in and let you know if you are on the right track.