So I'm working on one of these right now, and I'm using a quest from Riften to help me along. However, I have now hit a point that I don't know what to do. Looking at the Riften quest (http://i.imgur.com/rdb7a.png), it has custom property type which I am not able to set. I looked at a few gather quests and they all had something similar to this. I'm wondering how I go about making a property type like FFR07QuestScript, which counts to see if you have the right amount of materials. Whenever I tried to make a custom property like that, it would say it's not a recognized property and the compile would fail.

Have you looked at the source code and attempted to copy how they declared the property from there?

Basically what they're doing is setting another script as their property, but you don't necessarily need to do that. If you have a script you want to reference as a property another way is to attach it to a dummy quest, and then use the following syntax

Quest Property DummyQuest autoevent OnNonsense();some nonsense(DummyQuest as DummyQuestScript).TheNameOfTheFunctionWithinThisScript(PropertyType PassedInValue);more nonsenseendEvent