[OS X TeX] Novice questions: Including graphics in Plain TeX, pdfsync, controlling page sizes

[AES]

Making the painful transition from Textures to MacTeX and TeXShop 
from the 2005 TUG CD.  They're working -- but help with a few 
residual aches and pains would be appreciated.

All the following is with an iBook G4, Mac OS 10.3.9 and TeXShop 
1.43, and is focused on Plain TeX, NOT LaTeX.

1)  Including graphics in LaTeX documents works fine, but can one 
also include graphics in Plain TeX documents using TeXShop?  What 
formats are possible, and how to do it?  (The TeXShop and MacTeX 
documentation is unclear, to me anyway, on this point.)

2)  Getting pdfsync to work?  The pdfsync.tex file is installed in 
~/Library/texmf/tex/plain/, and the other pdfsync files are also in 
their appropriate places, but nothing happens in Plain TeX.

(And by the way, does "texmf" stand for something:  "master files"? 
"metafont"?  And if I put some of my own auxiliary or boilerplate 
files into the /texmf folder -- for example, into a 
~/Library/texmf/myauxfiles/ subfolder, can I then "input" those files 
into TeXShop source files located elsewhere in my file system?  Will 
I need to include an alias to such an auxiliary file in the same 
folder as the TeXShop master file?)

3)  Some of my documents are standard letter size, but I also want to 
preview and save slides with the typeset area in landscape mode. 
Textures displayed a nice thin blue outline around the typeset 
preview region as determined by \hsize and \vsize settings.  Any 
analog to this in MacTeX/TeXShop?  (I've been using \hrules at top 
and bottom of typeset page as a workaround.)

And when I'm creating slides, TeXShop just doesn't seem to recognize 
it if I change the Page Setup in the TeXShop File menu to Landscape 
mode.  The "artboard" area in the preview window (the gray region 
around the white preview region) doesn't rotate to landscape 
orientation, for example, and the PDF pages that are created aren't 
in landscape orientation.   Where do I learn about controlling the 
preview and output PDF pages? (again, in Plain TeX, not LaTeX))

Thanks . . .
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