I'm not exactly sure how the things in the ideas creator works. If anybody could help me with that, it'd be much appreciated.

What is it you're struggling with exactly?

As brief rundown of the field:

Name - This will be the name of the idea, and will be used in the idea's ID (should you need it later on)

Group - Whereabouts in government the idea will be used

• Economy - Economic law; Civilian Economy, Total Mobilisation, etc.
• Mobilization Laws - Manpower law; Disarmed Nation, Service by Requirement, etc.
• Political advisor - The 3 in the top row you can choose; Silent Workhorse, Fascist Demagogue, etc.
• Theorist - The one which can make doctrines cheaper; Nuclear Theorist, Military Theorist, etc.
• High Command - The last 3 you can choose for any military boosts; Naval Bomber Expert, Cavalry Genius, etc.
• Army Chief - The one which only affects army boosts
• Navy Chief - The one which only affects navy boosts
• Air Chief - The one which only affects air force boosts
• Country (National Spirit) - Ones which you cannot choose; usually added via focuses/events/etc.
• Trade Laws - Things which affect resources to market; Free Trade, Closed Economy, etc.
• Tank Manufacturer - Gives boosts to tank research/tanks produced
• Naval Manufacturer - Gives boosts to navy research/ships produced
  
• Aircraft Manufacturer - Gives boosts to air research/planes produced
  
• Industrial Concern - Gives boost to industry research; usually a choice between faster industry or electronics research
• Weapons Manufacturer - Gives boost to weapons research; usually a choice between guns or artillery research 

After selecting what you want to create, there's a chance a "Ledger" field will appear in the list. This just determines what branch of the armed forces it relates to (changes icons the game uses)

Description - Description for what the idea is/does/why it's there (think the text that appears when you hover over a national spirit)

Traits - Any pre-defined traits the idea has; silent workhorse, for example.

Cost - How much PP it should take to hire them (where applicable)

Removal cost - How much PP it should cost to remove them (where applicable). Leave blank for no cost.

AI will do - How likely the AI is to take it

Allowed - What conditions must be met for it to be available to a nation; tag = GER - for Germany. This is checked on the first time the map is loaded.

Visible - What conditions must be met for the player to see it in the list; playing the right country, completed a focus, etc.

Available - What conditions must be met for the player/AI be able to select it

Cancel - What conditions must be met for the idea to be automatically removed

Equipment bonus - Adds modifiers to specified equipment; e.g. lower production cost for guns

Research bonus - Adds modifiers to specified research; e.g. make planes faster to research

Targeted modifiers - Specific modifiers with a target relationship

Modifiers - Any other modifiers not previously covered

On Add - An effect to happed when the idea is chosen

On Remove - An effect to happen when the idea is removed

Thank you