Help with the correct commands for some modules

[ctsuperchris]

So I will admit, I don't know lua scripting; what I accomplish is primarily done by finding code that does what I'm trying to do, and making the necessary adjustments. So anyway. On my server I am making changes to tie trust more closely to actually interacting with the NPCs in question, as well as make the experience as solo friendly as I can. And I have been able to make the changes I wanted by editing server files directly. For example, with Brygid the Stylist Returns:

quest.reward =
{
    fame     = 30,
    fameArea = xi.quest.fame_area.BASTOK,
    title    = xi.title.BASTOKS_SECOND_BEST_DRESSED,
    item   = xi.item.CIPHER_OF_BRYGIDS_ALTER_EGO,
}

That said, I understand that it is better to put something like this in a module rather than editing the server files directly. However, I'm not finding anything in the example modules that is working to do that for me. The command I've tried that looks most right to me (but I'm either doing it wrong or using the wrong command) looks like this:

require('modules/module_utils')
require('scripts/quests/bastok/Brygid_the_Stylist_Returns')
local m = Module:new('brygid_reward')

m:addOverride('xi.server.onServerStart', function()
    super()

xi.module.modifyInteractionEntry('scripts/quests/bastok/Brygid_the_Stylist_Returns', function(quest)
	quest.reward =
	{
	    item     = xi.item.CIPHER_OF_BRYGIDS_ALTER_EGO,
	}
end)

return m

Similarly, there is one other example of a place where I've gotten the change I want to work by editing server files directly, but I'm not sure how to turn them into modules.
Letting the 24/8 Guild Vendors sell crystals; editing globals/shops.lua:

        [xi.skill.COOKING] =
        {
            4096,      10,      xi.craftRank.AMATEUR,      -- Fire Crystal
            4097,      10,      xi.craftRank.AMATEUR,      -- Ice Crystal
            4098,      10,      xi.craftRank.AMATEUR,      -- Wind Crystal
            4099,      10,      xi.craftRank.AMATEUR,      -- Earth Crystal
            4100,      10,      xi.craftRank.AMATEUR,      -- Lightning Crystal
            4101,      10,      xi.craftRank.AMATEUR,      -- Water Crystal
            4102,      10,      xi.craftRank.AMATEUR,      -- Light Crystal
            4103,      10,      xi.craftRank.AMATEUR,      -- Dark Crystal
            936,       16,      xi.craftRank.AMATEUR,      -- Rock Salt
            4509,      12,      xi.craftRank.AMATEUR,      -- Distilled Water

(Repeat for each Guild)
There are two more things I'm trying to do, but I'm not having any success even with editing server files directly; if I could get examples for both of them, I could probably use them to make similar adjustments in the future as I work on tweaking other nations besides Bastok. The first is that I'm trying to get the gate guard in Bastok to give you the map of the Zeruhn mines as part of accepting the Zeruhn Report mission. The second is trying to add The Zeruhn Report as a prerequisite to the quest Trust: Bastok, so that way you've at least met Naji before you get his trust.