I recently converted the TextMate SCSS bundle to a Sublime package. Compare the two branches:
Basically, snippets can stay in a sub folder, everything else comes out into the root of the package. TM commands don't work in ST, so you'll have to either port them or lose them. See the following thread for a few more bits of info:
Also, make sure you don't have any characters in filenames that are incompatible with Windows in there (Sublime is cross-platform, remember).
Let me know if you have any further questions.