Convert Sketch to CAD & STL

I already have a hand-drawn sketch of a small mechanical part, complete with key measurements. I now need that concept turned into a clean, accurate CAD drawing and a watertight STL that I can feed straight to a 3-D printer... (Budget: $10 - $30 USD, Jobs: 3D Design, 3D Drafting, 3D Modelling, 3D Printing, AutoCAD, CAD/CAM, Fusion 360, Solidworks)