How would I get started doing a dialog-driven mod?

[bingchat1]

I would like to create a mod that adds textual dialog to TS4, where the contents of the dialog is driven by sim-specific variables I set.

 

For example, if player selects "Resume Conversation...", it shows the following dialog options that they can click:

 

1. How's it going?

2. [seen only if targetsim has variable "spoke_about_theft_previously"] Did you find out any new info about the theft?

3. [seen only if targetsim has variable "romance_started_with_playable_sim"] I care about you, you know

4. [seen only if targetsim has variable "quest_return_stolen_locket"] Here's your locket, I got it back
 

I would then also like to have the sim talk back to our player, again by controlling the dialog. For example, if the quest from dialog #4 is now resolved, I would like to have the companion sim say "Thank you so much! In fact..." and then be able to start a WW animation.

Is this doable in Sims 4? If so, how would I get started with this?