Well, firstly while outlining seems like a smart thing to do it turns into quite a challenge later when you want to cover it.
You need basics - extrude, scale, rotate, select from one vertex to any other with one ctrl click or select loop - faces, verts, edges.
You need to get familiar with some addons which make tedious things a breeze - F2, bsurfaces, loop tools. Guess that’s it to start drawing not outline but 3d surface. Draw rough, follow forms. Modifiers - subdivision surface, bevel, makes sure object has enough faces and looks smooth.
Sculpt comes after you’ve done basis.
There’s a file to see the setup and to have some fun with skinning the animal ;). Or you could try sculpt on wings which were the easiest part.