I am happy to help you, for someone inexperience with CAD the
learning curve is pretty steep. The type of modeling you're referring
to is usually done with Booleans, and they can be tricky at first.
However, here's some tips. Create each artistic element by creating
the 2 dimensional curves first (make sure all the curves are joined
into one curve), then using the Solids menu, use the command Extrude
Planar Curves to create solids from the curves (the term CURVES
includes straight lines by definition). If you want an inset area in
a cross or medallion, create another solid and Boolean Union the two
together to create one solid from them both. For lettering, use the
option to create solids from the lettering dialog box, then use
Boolean Union to add the lettering to the model. Here's a site with
some tutorials http://market.renderosity.com/~rhino/index.htm I'll
even do them for you if you like, or step you through them. Please
email me directly (address below).
(the email address is spelled differently than my name is spelled...)