can't i ask more from here also?
If we were to tell you all the various situations where a certain lens is best, then create another list which tries to recommend types of lenses for certain situations (factors including lighting, time of day, camera model, with/without flash, etc) and then list the "must have shots" and the recommended angles for each type of wedding and every known wedding venue and combination thereof, then still magically predict crowds, positioning, attitude of guests, etc, and then factor in the various styles photographers may have and develop, we would be sitting here for 4 years typing a huge book with a massive excel spreadsheet. And I'm not kidding - there are sooooooo many things to consider.
Nothing, absolutely nothing, will beat actually being there, and being mentored by an experienced photographer on the scene, who is familiar with the type of shots the customer wants. This way you develop the instinct for what to take, with what gear, in what situation, at what time, etc, all catered to *your* style.
You are looking for a magic formula where there is none. You are looking for guidance from people who will not be there, don't know the location, lighting, etc, the style of wedding, the attitude of the customers, etc. You are obviously woefully underprepared for this, and we are telling you what the very very very best way to learn is - talk to the main photographer. Be his apprentice. He will tell you what to do, whether to use flash or not, etc.