I hope this helps 
I think you’re describing what we call “layers.” And yes, wedding cakes here almost always have multiple layers. I’ve been to one wedding where they tried to do a cake cutting with a sheet cake (with just 1 layer) and something about it just didn’t look right.
If your goal is to duplicate common practice in Western culture, you and your husband would hold the knife together and cut the cake, then feed each other some cake.
There are plenty of wedding cakes that don’t have flowers on them…with designs made from colored frosting instead. The flowers you see on cakes are usually real flowers that have been cleaned thoroughly for that purpose, and are just there for display. They’re removed when the cake is taken back to the kitchen to be sliced up for the guests. You can also have edible flowers made from sugar icing…but they don’t look nearly as realistic.
The “broad knife” you see is a spatula, which is used to lift up and serve the slice after its been cut. You would use the long knife to cut the cake.
I don’t think you need to have soft drinks on the cake table…in fact, I’m not even sure where you’re getting the idea that its customary here?
In Western weddings, those matching glasses are used for serving champagne to the bride and groom. Since I doubt you’re going to be serving champagne at your wedding, I really think they would be unnecessary for you. Personally, I think using champagne flutes for other beverages looks tacky.
I don’t think there’s any hard & fast rule about this. By favors, I’m assuming you’re talking about the bidh packets you’ll be handing out…I’ve seen ones that weren’t personalized at all, ones where the ribbons had names printed on them, and ones where the pouches had names on them. I think its a matter of personal preference.
If you’re trying to follow Western tradition, thank you cards are typically hand written by the bride and groom on cards and mailed out to guests after the wedding. Leaving notes on the table would be considered impersonal and in poor taste.
Essentially, they’re schedules of the evening’s events/rasms.