I's like to know software for this. I know Blender. Is it OK for my purpose?
Also is there any good tutorial on this topic?
Like how to draw a draft and then 3D print it.
For simple parametric CAD, use a trial of Fusion360 or Solvespace. Then 3d printing it is as simple as slice and print using something like Cura or PrusaSlicer. Plenty of tutorials for those two.