I play mincraft too. But I do not know what version you are playing. If you are playing 7.1, there should be more than 20 or 30
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Not including potions, there are 300 items and blocks if it isn't modded.
Once you have installed Too Many Items, when you bring your inventory up, you can choose from a list of blocks/items that appears by the side and click them into your inventory.
to rename items
Placing items in Minecraft is usually done with the right mouse button.
go into the minecraft source file(windows=Run-%Appdata%-->.minecraft/mac=finder-->Username--> Library--> application support-->minecraft) then go to saves then your world and copy the level.dat file to the desktop. go to minecraft then put all items into your chest. save and exit, then quit minecraft.replace the new level.dat with the one on the desktop and there you go, duplicated items!