Minecraft's Item ID's can be found on Minecraft Wiki. Link in related links.
No, you can't take one item from a Minecraft mod unless there is a separate mod which contains that one item.
Minecraft
The item ID for a diamond pick in Minecraft is 278. I have linked you below in the related links of a full list of all the ID's in Minecraft.
No
46
You can't.
there is no "carpet" item/block in minecraft, but people use different colored wool as carpet for minecraft.
you right click on a block
The item id for diamond in 1.3.1 is 264. If you want to see all data values and ids in Minecraft go to the link below.
You have to do the relevant collection mission in which you ask mafia to search for an item. they have to do a specific job over and over and hope the map drops. Any collection item of that collection can drop
right mouse click