For Ease of use with the auction house there is an addon called Advanced auction house, at http://rom.curse.com/downloads/rom-addons/details/advancedauctionhouse.aspx it will let you search several times at the same time, and optimizes the order.
For questing Advanced quest book is great, it can be found at http://rom.curse.com/downloads/rom-addons/details/advanced-quest-book.aspx it will mark the locations of active quests on the map, tell you who to turn them into etc. for dailys i would highly reccomend Dailynotes, found at http://rom.curse.com/downloads/rom-addons/details/dailynotes.aspx it will tell you what items are needed for a certain daily, the ones you can take at your level, and will even tell you if an item is used in a daily if you mouse over it.
The map in the game is lacking a little bit, so i highly suggest Getting WoWmap, which ironically makes the map behave alot more like World of warcraft, available at http://rom.curse.com/downloads/rom-addons/details/wowmap.aspx it will also provide maps for all instances and special events, allowing you to preview ahead of time.
For those of you who have troubles keeping up with all the buffs etc in the game there is a wonderful addon called NTbuff which you can set to auto cast spells for you, or drink potions. it is highly customizeable and really easy to set up. http://rom.curse.com/downloads/rom-addons/details/ntbuff.aspx
One other Great informational Addon to get is called Pbinfo, it will show you a great many things, and is like a mini addon pack itself.
To quote a line of text off of its website: "pbInfo offers multiple features to ease your daily Runes of Magic life. This add-on shows a tooltip with several information about the mob, player or NPC you are hovering, a tooltip with information about gathering materials and it modifies the target blood bars to show a mob's real healthpoints." it also has a threatmeter, chatlog and another quest tracker. it is available at http://rom.curse.com/downloads/rom-addons/details/pbinfo.aspx.