There are a bunch of inkscape tutorials out there. Go through them in order, they’re designed to help you learn step by step:
There’s a bit of a minimum complexity problem here. If you want to start designing your own things, then you’re going to have to figure out an editor.
If you want to just cut and engrave things without the design side, that’s where the GF store comes in. The designs they have for sale and free work well right away, especially when using proofgrade materials.