see answers below:
>
> 1. I am trying to end the roof with where the wall is on the second floor.
Using joining geometry doesn't work. Does anyone know how to do it?
The sketch that defines the roof should stop at the wall. Check the
"overhang" in the Options bar, and set it to zero. Your roof currently has
an overhang set.
> 2. The dome roof is created by 6 pieces and joined together. Is there a
easier way to do this roof?
Just create one roof, pick the six walls, and make them all slope defining.
>
> 3. Can I do dimension from two points rather than from the 2 faces or
centerline of the wall?
Hover over endpoint, hit Tab until the endpoint of the line to dimension
highlights, then click.
>
> 4. Is there online tutoring or booklet that would give me basic guideline
to use Revit. I've already try the tutorial material that comes with the
program.
You did all the tutorials that come with Revit? Some of your questions are
covered in the tutorials. Best resource is www.augi.com in the Revit
forums. You can buy several books that are available.