Thats exactly how i did it and worked out well for me
I had bought some transparent thin plastic file covers from staples and labelled them. All 4 files i made for the case had their respective stickers on the front.
Make sure you are not missing any documents and also that all the documents are in the right order in the right file
1) Sponsor Forms ----- Sticker on file saying Sponsor forms
2) Applicants Forms ----- Sticker on file saying Applicants forms
3) Supporting Documents ----- Sticker on file saying supporting Documents
4) Wedding Proofs ----- Sticker on file saying Wedding Proofs