first off, learn and memorise the hero’s journey: https://www.youtube.com/watch?v=Hhk4N9A0oCA
heroes journey is the very basic structure you’ll need, to form a narrative. don’t bother toying with it though, because you’ll just end up with the same structure again. Secondly pick your setting, themes and aesthetic etc. study and build a world that interests you and readers - moreover try and get some feedback from someone you trust. Don’t try anything too deep or difficult to write because you seem pretty inexperienced anon, but definitely go for a story unique to yourself. If you enjoy backgrounds make a scenery and setting heavy story, with simple but likeable characters. if you enjoy characters make some out of the box, insightful personalities with depth in a simple more linear world. In other words try and prioritise your strengths. Have a read of popular works in the field, are you thinking of a webcomic or webtoon? read the popular stories in those areas, realise the standards and popular ideas.
If you’re really struggling anon, have a look at some poetry or famous short stories and illustrate those.
Best of luck anon.