My main question is, are you starting a local to try to expand or to try to affiliate with a National?
If there is just a few of you, then, I would not worry about a pledgeship untill you reach a said amount of numbers of membership.
When I started mine, I worked to get 20-25 who became Founders of BX.
I had already designed the Badge, Pledge Button, Coat of Arms and Banner.
The reason guys joined was they did not feel they wanted to be part of existing Groups and felt like they wanted to be part of something new and could make it grow themselves.
Point out while it is "NEW", there is the ability to help be a part of something new!
Here again, it might make a difference of the type of and size of teh school and Greek Community on campus.
I have been there as some others have and all I can Do Is Wish You The Best of LUCk. It does take a lot of hard work and many tears to make it!