I'll echo a bit of what Chairy said, albeit less eloquently and less psychotically
The new players in the game have a great advantage that a lot of us didn't have: numbers. I started playing DDO in mid-2008 when the game was at the start of its biggest decline. The LFM pages were empty. I had to, literally, beg my way into my first Shroud (some people posting in this thread were in my first Shroud, as a matter of fact).
I basically solo'd a dex-based, low-con, pooly equipped, untwinked pure rogue through levels 1-12. I didn't do this to prove I could, I did it because I really didn't have many other options. There were simply few, if any PUGs. I could write a book on the number of quests I fought my way through only to die to an unkillable (by a gimpy rogue) final mob.
When I was playing the mid-levels, I never ONCE saw the LFM page full. I'm not talking about being full of quests my level, I'm talking about never being full of ANY quests. Last night, however, there looked to be at least 5 FULL PAGES of LFMs. There were speed quests, F2P quests, zergs, and crawls listed. I'm fairly confident any player at any level could find a quest that suits their play style with that many options on the LFM page.
Additionally, if, for some reason, the exact quest you want to run is not listed, I'd bet you could fill an LFM wicked fast if you posted it. Even an LFM that says "I don't know it so we'll figure it out." would probably fill.
This all being said, I love playing teacher in a quest and would gladly help new players learn it. Unfortunately, I don't know many quests well enough to teach them But if anyone needs a guide for Prove Your Worth, Two Toed Tobias, Tangleroot, or Stromvold's Mine, I'm your guy!