Just thought I would also mention that there is an "official" website for Uru, that has tons of info for newbies and veterans.
It's Gametap's official site. You will be seeing these initals a lot....MOUL...which stands for "Myst Online: Uru Live". Which is also the name of the website.
I get most of my information in the "forums" on that site. They also have complete walkthroughs and hints and tips. I find that it is the type of game that you almost have to read the forums to find out what is going on as you explore. Especially if you are new to it all.
This is a link to the MOUL site that has lots of info put together for newbies...MOUL Website Link
Don't get overwhelmed though. The best way to start is probably to just do the Cleft and the first 4 ages first (Gahreesen, Teledahn, Kadish Tolesa, Eder Gira & Kemo).
By then you will have a much better feel for the game and then you can venture out more and start exploring the new areas and socializing with fellow gamers.
If you need help while doing these ages, you can invite someone else to go with you and help you figure out what to do.
If you need help with Eder Gira and you see one of us online, be sure to ask for help. I would be more than glad to walk you through it or guide you. I have finished everything available now, so I would love something to do while I am hanging around.