To get the xyz stand outside of the building, somewhere not in a building, in HB hit developer tools, and where it says my location 0 0 0 double click the 0s and it will put the xyz into the Hb log, copy and paste that into a document, and put the name of the location after it (north barrens crossroads)
To get the ID of the pumpkin and quest go to wowhead, look at the achieve for the continent you're on, each quest is listed as a requirement.
The Quest ID is the number in the URL of the quest
The Pumpkin ID is the number in the URL of the link on the right side that says candy bucket (since the pumpkins are actually candy buckets)