I pretty much use CAD because I don't have room for a table. Hand drawing is fun, but CAD makes it much easier to change/clean up drawings. The transition from paper to computer is not easy or intuitive
Get a free program, almost any one. They have been designed since AUTOCAD and use the same style interface with rows of tools around the edge, places to enter absolute or relative points, and other fancier tricks. If you want, you can put things on different layers- outlines on one, details on another, internals on a third. If you can remember what belongs on each layer it's much easier. Otherwise you end up drawing from one layer to another and then putting the wrong stuff on the layer. More hassle than erasing a pencil drawing.
Before Windows 10 I used Drafix CAD Ultra, circa 1992-93. It's quite limited, but more than sufficient to draw a very accurate set of plans. It's especially helpful when printing something because you can see pretty much how the lines will look on paper. More modern programs can get complicated because every line, in fact often parts of lines, can have its own parameters, or style.
The latest program is a version of Turbocad for Windows. It's OK, but I'm not fond of it. It is perfectly accurate if you draw to absolute points, vertex, midpoint, it shows extend guide lines, etc. If you draw more or less freehand it uses arbitrary limits for +/- distance, angle resolution, etc. so sometimes nothing lines up if you draw on a full sheet and then look at a close up and nothing quite lines up. It can get lost. It's kind of slow. It can lock up unexpectedly. I need it because the core cutter needs DFX files to make Gcode for the cutter. It will draw valid DFX files without too much trouble. For lazer cutting the drawing has to be cleaned up to eliminate overdrawn lines, points, shapes etc. and has the right line with since many lazers interpret that as power.
Another program to think about is Coresdraw 12 or so. It is an illustration drawing program and uses a completely different way of drawing. It emphasizes lines, curves, shapes, fonts, fills, shading, etc and can make some stunning drawings. I use it mainly to translate DXF files. It will work on anything up to Autocad 2000 back to 2.6. It also works on debugging a drawing. I had one that had a "0 length line". It would show up in an item info screen but couldn't be erased, moved, or drawn. Corel erased it easily by selecting it and hitting delate.