Modding Minecraft help?

Okay, so when I try to add mods to minecraft I have followed all the instructions. I downloaded the files *duh* I ran %appdata% and found my .minecraft folder. I then when into the bin folder and opened minecraft.jar with winrar. I moved all the mods (modloader, 303's arrow pack, and GuiAPI) from their folders into minecraft.jar. Then I deleted the META-INF folder. I closed winrar and opened minecraft. When I tried to make the torch arrow nothing happened! I have tried this with other mods and got the same result. What did I do wrong?