Custom character item help

[Intuitive]

I'm looking to add a few custom items for my character, but I am very inexperienced. I'm not sure if all my ideas are possible, and I have no idea where to start with coding them. Any help would be greatly appreciated!

Here's what I'd like to add:

1. A Dream item

- Would be collected after waking up from sleeping.

- Could only be used by the modded character.

- Could be used on sleeping mobs to extend their sleeping time and prevent them from waking up until the Dream wears off.

- Could be harvested from sleeping mobs.

- Could harvest dreams from sleeping players. Webbers would give two dreams. Cannot be harvested from Wickerbottoms.

- Could be used on self to restore some sanity over time, but become groggy until it wears off.

- Could be used on non sleeping mobs to slow them down and weaken their attacks. 

- Could be used on other players that are awake to temporarily make them groggy and gain sanity until the dream wears off.

- Could be used on sleeping players to boost sanity gain.

- Would dissipate if dropped on the ground, and cannot be placed in containers.

2. A Nightmare item

- Crafted from 1 Dream and 1 Nightmare fuel in the Magic tab.

- Could only be used by the modded character.

- Immediately wakes the sleeping mob it is used on, and prevents them from falling asleep for some time.

- Could be used on self to prevent sleeping, grogginess, and stop any sanity gain until it wears off.

- Could be used on sleeping players to instantly wake them without becoming groggy, lose 15 sanity, and prevent any sanity gain until the nightmare wears off.

- Could be harvested from sleeping Wickerbottoms.

- Would dissipate if dropped on the ground, and cannot be placed in containers.

3. A Nightmare sword

- Crafted from 1 Dark sword and 5 Nightmares in the Magic tab.

- Does extra damage to sleeping targets, and does not wake them.

 

Would these ideas be possible to implement? How would I go about doing this?