What Design Space can and cannot draw
Design Space gives you basic shapes, text, and the boolean operations — weld, slice, contour, offset. That is enough for layered word art and a monogram, and it stops short of anything that needs a drawn curve: you cannot edit a path node by node, draw a freehand outline, or build a shape that is not a combination of the shapes it ships with.
That is why most people who design their own files draw elsewhere and upload. Uploading your own SVG is free and has never required Cricut Access, which covers Cricut's own image library rather than the upload button.
Tracing a picture is not the same as drawing one
Auto-trace guesses where the edges of a photo are and writes a path along its guess. On a clean high-contrast silhouette the guess is decent; on a photo it produces thousands of nodes, a faintly polygonal curve and a cut that stutters on vinyl and tears on cardstock.
Use tracing for what it is good at, converting a hand-drawn sketch inked in solid black, and expect to clean up the result. And check what you are tracing: a character or logo from the internet is still that owner's artwork after it has been through a trace.
The four rules that decide whether a design cuts cleanly
Closed paths, because the machine cuts the boundary of a filled shape and cannot decide what to do with a line that never comes back. Minimum stroke width, because anything under about 0.08″ in vinyl weeds out with the waste. One fill colour per intended layer, because that is the only thing Design Space separates layers by. And real physical units, because a file exported in pixels arrives at whatever size the importer guesses.
Nearly every "it imported but nothing cut" report is one of those four, usually the first: a shape drawn as a stroked outline with no fill looks right on screen and contains no area to cut around.
Designing in the browser here
The studio is built around that list: shapes and text with genuine path editing, weld, slice, contour and offset, operations assigned per layer, and a canvas that works in inches against a real mat so the size you see is the size that cuts.
It is free to use signed-out, with no trial timer and no watermark on what you export, and it exports SVG, PDF, PNG and DXF. What it does not do is drive the machine: Design Space is the only software that can send a cut to a Cricut, so the last step is always uploading your exported SVG there.
From your own design to a design you sell
A design you drew yourself is yours, which puts you in a different position from someone reselling a purchased file: you can sell the finished products and, unlike most licensed files, the file itself. Keep your source files and a record of the fonts you used, because font licences are where original designs most often go wrong commercially.
The practical side of selling, pricing against real blank costs, what a commercial licence covers, and filling personalised orders without editing twenty files by hand, is covered in the Etsy guide.