Hi! Where are you having issues as far as creating the assets? Please elaborate and we can attempt to clarify.
Hello! When using Edit Mode to move points smoothly ensure that proportional editing is toggled on (see below for example).
In both Edit Mode and Sculpt Mode you will want a nice big fall off ("brush size") to achieve the smooth curve. Tap "F" and move your mouse or stylus left/right to change the size of the fall off. There should be a circle around your cursor to indicate the size of the falloff. Click once to lock in the size.
If you need further assistance let us know!