I've been using SketchUp for several years now. This year I spent the money on the Pro version so I can export files to my metal fabricator to feed into their CNC laser cutter. But if you just need human readable files then SketchUp is free.
As for the curved text you are looking at something like Inkscape (free) or Adobe Illustrator (subscription fee). That is in the graphic arts realm. I have a friend who has the pay for it software and will do work for me for $25 USD a drawing. She did the logo for our business and also our Christmas ornament design.
Matt
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