No worries. All of us were beginners at one time.
I’d advise you pick one of the software programs and fall in love it with. I’m an Adobe Illustrator guy myself, but many here use Inkscape because its free and not Adobe (I happen to like Adobe).
You can browse this post, at the bottom of it is a table of content that links to a lot of user generated help files here on the forum.
There is a ton of content on YouTube also, just use Google to find things.
Or, you can always ask here 