Idk i just make em, dont really have any tips, i say just start by tracing, then you get used to it and start making them on your own

Actually i do have 2 things, how i make them moveable i add a segment to the end of the foot, turn it invisible, and start making the boot there, that, youll be able to turn it.

Also, make sure to make the end of the leg the same color as the shoe for it to function right.