Perhaps I shouldn't say this for fear you try to incorporate this into your botting too soon. The add-ons that I use with Gatherbuddy are the following - Ace3, Auctioneer, Auction Profit, Bagnon, Postal. I will now explain what each does shortly in order that I listed them.
Ace3 - Needed to run Postal or perhaps Bagnon, not sure what it does, but it is needed for one of those two add-ons.
Auctioneer - Best add-on ever, allows you to scan the auction house and tells you what you should sell the items for, as well as posting all your items in your bags quickly and efficiently (is fairly confusing at first, but there is plenty of videos on how to use it on the net).
Auction Profit - basically tells you how much your auctions on the auction house will get you if they all sell for bid or if they all sell for buyout on the Auctions tab of the AH.
Bagnon - don't really need, but organizes your bags nicely, makes viewing all your items easilyer. (<--- lol easilyer)
Postal - Just hit one button and it will take all items and money in your mailbox, so you don't have to shift click each one, saves alot of time. There are the only add-ons I use, I personally use Gatherbuddy a lot more than Honorbuddy, so if you are using HB more you will need to use other add-ons, but even if you are, all of those will still help you greatly. I am going to go ahead and wrap this up because this is way too much text for an American to read/write.