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Before spending any money on software, I think you would be best served by learning some fundamentals on how they work. Things like idealization of properties and boundary conditions are critical when performing solutions in any of those things (garbage in = garbage out). I recommend getting a free cad package (https://www.freecad.org is a good option) and then making some basic tools in Python or even Excel to solve basic beam and plate solutions.
For a completly free package you can use OpenFOAM for CFD (and bit of FEA) and FreeCAD for CAD while I dont know how good it is. It also has built-in FEM workbench I believe. And there is something called CfdOF (https://github.com/jaheyns/CfdOF) it combines freeCAD with OpenFOAM but again I didn't used it so I am not really informed.