Wings3D is very easy to learn, if you want a flatter learning curve. And plenty powerful... entire humanoid figures and very sophisticated clothing (among other models) have been developed in Wings3D. Lots of support, too.

Blender, is great - I use it exclusively - but the learning curve is a bit steeper, initially. There's a new interface just out... and it won't be long before it goes out of beta, but it's quite usable the way it is.

There are for-pay programmes out there, but if you're just dabbling, you might want to go with the free ones first, just to get a feel for it.

You would export your model as an obj file, which you would then import into Poser. It's a real blast to make your own stuff, incredibly satisfying, and the potential for expanding your ideas is boundless when you do your own modelling. It can be frustrating, at times, but there's heaps of help around... you'll be spending a lot of hours reading these forums for how-tos.

Lots of luck... remember to enjoy!

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks