The nice thing about Medium, Suzanne, is that you can take things at your own pace. (Unless you want to Make Serious Money, in which case you want to post stuff like a caffeinated gerbil who is trying meth. But there are other regular posters who can help better with that. 😉)
I got started slowly and left responses, got feedback on things I posted, had pieces where I experimented and poetry I recycled from my younger days and eventually developed a regular schtick with “Conversations with My Wife.” I also picked up a regular set of folks (my Medium peeps, as my wife calls them) who are supportive and kind.
Maybe try submitting to one of the Medium publications, if you like challenges. Have fun, experiment, and find your own level. You’ll be fine. 😊