Re: First legendary item quest clarification.
I'll have to go by memory a bit -- it's been a while -- there are quests that start at the entry to an area in Eregion called "The Walls of Moria"; two types of quests; I believe they are called "Expeditionary Quests" and Epic"; if you do not complete the expeditionary quests before you finish the epic series, you can't go back and finish them.
Without stealing any of the surprise, the epic series will take you into the first "room" of Moria. You'll get your first Legenday WEAPON -- not the Legendary class item -- before you get to that point; you will be told to level up that weapon before proceeding with the quest line.
I recommend you do both the expeditionary quests and those leading into the Mines of Moria; they can all be done solo, although you will be hard-pressed at level 45, especially in a shared instance cave with lots of half-orcs (Filogan, IIRC).
I'd expect that you'd gain a level-and-a-half going through that process; however, I'm guessing because the rate of leveling has been so dramatically increased since I went through on all seven of my level 65 toons.
Note that your LI is not going to level killing lower level mobs in the Misty Mountains.
[COLOR=teal][SIZE=1]ALTS: Schartestuffe - 65HNT/SMK Woodworker/SM Farmer || Maggae - 65MNS/SMK Jeweler/SM Cook || BilaeBaub - 65BRG/SMK Tailor || Ealkimme - 65LM/SMK Scholar/SM Weaponsmith || Koracion - 65RK/SMK Tailor || Ealmariah - 65WRD/SMK Weaponsmith || Ealdaebwen - 47CPT|| Kraeli - 39CHM || Kittenne - 26MNS[/SIZE][/COLOR]