Preferably don't try to vectorize by yourself programs for vectorization love to make a mess of tiny segments that's about impossible to straighten out and make usable for CNC. If you absolutely must include a bitmap graphics, submit one in possibly big resolution, to be vectorized. Similarly to above, all "zero width" gaps between elements should be replaced by the elements being fused together. That means, merge all partially overlaying elements, don't use invisible elements to mask parts of the visible ones, put (even minuscule) distance between corners that touch - or opposite, extend a little and leave a tiny bridge no joint at a single point.
all texts are transformed to curves (you can't be sure the makerspace has all the same fonts). Same, dashed line is a row of rectangles, not a line with style: dashed. If you need a 0.5mm thick line that's 10cm long, you don't draw a 10cm line and set its thickness to 0.5mm in properties - you draw a rectangle of 0.5x100mm using default style line, or any other style the styles are all stripped when converting. all elements are closed - closed curves or sets of segments contours enclosing the shapes. You just come with the properly prepared "high-level" format file like DXF and let the CNC operator convert it to the correct STL. And editing a wrongly generated STL to fit the machine is usually far more headaches than it's worth. While most CNC machines use STL, there are subtle differences between dialects, there are idiosyncrasies concerning spindle speed, tool changers, tool profiles, material removal with thick tool, fine finish with fine tool, and so on, and so forth. 
Properly prepared DXF is the safest choice.
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