You take the whole stack, and right click the stack onto a free inventory, crafting, furnace or chest slot. This will remove one item from the stack, and can be repeated if more items are to be seperated.
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No, they only pick up blocks that are in the world
All you do is right-click, and press B to go to a whole inventory of blocks. Source: minecraft.net/classic/play
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.
You can right click on a group of blocks to pick up half of it, or if you are already holding it, you can right click on an empty inventory space to deposit a single unit.
Just right click the top of a block. If you mean how do you stack them in your inventory, it should be automatic. Unless its a door, a tool, ETC