Step parent, no bio child yet

Newly divorced and just thinking about eventually getting into the dating world. I have no children yet but I do really want to have a baby of my own and a family. Met a man with a couple young children and while I have no idea if there'd ever be anything serious between us, it did get me thinking about that scenario. I am not opposed to dating a man with children. But it did make me feel a little nervous like if I'd be able to jump into being a step mom when I haven't ever been a mom. Just curious about peoples experiences with similar situations or advice if I find myself in that situation (even if its a different guy down the line).

Please note I'm not worried about being able to love someone's children as my own in that scenario, more about just knowing how to step in and parent them. Also I worry that I'll be sad I missed out on some of their life already.