@danbee78

Here is a list of some YT videos that you might find helpful, it compares the Ender 3 (cheap) vs the Ender 3 Pro (just a bit more). I would lean toward the Pro, personally.

vs. vs.
These videos are from YT'ers I can actually listen to without wanting to throw things at the screen.

Also you will need to learn how to model in 3D, it is not exactly the same as 2D CAD and the applications are different. I would look at applications such as Tinkercad, the open source FreeCAD and OpenSCAD, SketchUp and Fusion 360. I have used most of these myself, but since I have now 4 years of 3D modeling under my belt, I use Fusion 360. You can model with things like Blender but it is not primarily designed for making models you can actually print. There is more software you will need to complete your workflow from model to print but I don't want to overwhelm you in one message.