Well! Dragons are generally reptiles, so looking at other reptiles is a good idea.
There’s lots of different kinds of reptilian feet, you could have something mitteny like a crocodile
or some pudgy toes like a gecko
or some very long toes like a lizard
It’s honestly depends on what kinda dragon you’re making!
To anthromorphise something though, you need to be familiar with both the animal’s and human anatomy, because what you’re drawing is a mixture between the two.
There is a lot of freedom to be had with drawing dragons, anthro or otherwise. Your typical western dragon looks something like a cross between a lizard and a cat, anatomy-wise
And you can find plenty of tutorials on this style of dragon, KyriaDori’s is very nice.
But! There’s nothing stopping you basing your beast on a crocodile for example
So don’t feel locked in on that one style of dragon. Have a look at and study various different reptiles and see what traits you think best suit your character.
But anyway, lets actually get onto drawing those feet. Dragon feet, particularly the hind feet, I find are often quite similar to human feet. Especially so if you’re making an anthro!
I think that the construction that N3MOS1S uses for human feet works very well if you elongate things a little bit:
Breaking things down into blocks and spheres will allow you to draw them from any angle you wish!
You can adjust the shapes to suit what kinda foot you want, like longer toes for a more lizardy foot
or more mass for a croc like foot
As for the legs, I again suggest reading KiaDori’s tutorial, as it’ll help you understand what kinda legs dragons have.
Then you just need to blend it with human anatomy until you reach a medium you’re happy with
13thblackcat wrote a couple tutorials on combining ungulate anatomy with human anatomy if you need some help with that process!
But again I’d like to stress that you don’t have to restrict yourself to one specific way of drawing dragons!!
as for the flying question, I’d go have a look at my bat wing tutorial.