Anyway, over the years I have been following a 3-step routine in organizing my stuffs. I want to share them as I hope they'll serve you well as they have me.
1. SEGREGATE ITEMS BY GROUP - At home: Get one big box to pile in all your wedding materials (e.g. magazines, wedding supplier calling cards, DIY materials). This way, you free up some space already and you have all your wedding stuffs in one area. On your computer: You can apply this with wedding materials you accumulate on your computer. Create on folder and name it like 'Wedding Stuffs - To be organized'. This way you know exactly what's in it and you know that it still needs to be arranged. Start dragging all wedding-related documents, folders, and etc. here.
2. ORGANIZE THEM - At home: Group all related items together. Say wedding magazines: arrange them in one pile and the same goes to other related items (e.g. supplier pamphlets together). You may need a separate table (or bed, hehe) to put the grouped items on. On your computer: Create another folder and name it 'Organized Wedding Materials'. Inside, start creating individual folders for wedding gowns, wedding cakes, flowers and so on. You can micro-manage this even more by being more-OC when it comes to grouping together wedding items. For example, in the 'Gowns' folder you can create two separate folders to indicate bridal and entourage wear (I'm guilty of doing this). Then, under the wedding entourage folder, you can add new folders to indicate the color or style. You can do this on the other wedding categories as well.
Hope this helps.
PS. Those wedding stuffs I just finished organizing (especially on my PC)? The many resource materials I have but can't delete because I cannot, for the life of me, narrow down to what I and Mr. J want our overall wedding will be (from gowns to color to reception look). I am no bridezilla, but I am going wedding overdrive though.