Widescreen Mod
If I don't use the widescreen mod, what will my game be like (i do have a widescreen lol
Put that exactly as the last mod to be installed, as you run the risk of F'ffing your QUI otherwise. And the mod just gives you a chance to put higher resolution to the screen size, even in 4:3 ration, as long as your monitor and graphic card can support the said size. And to answer your question, the game will have great black sheds over the areas where you could have the game area shown.
Also, the Song and Silence mostly adds kit's to the BGII, and IwD doesn't have them -bad, also the store has wrong area etc. code which would need to be redone etc.- in conclusion it won't work if you won't go and modify the mod radically, and even then it's easier to make your own mod for the IwD.
You don't need the IWD Official Patch&HOW Official Patch, as the ToLM is the latest patch for the game.