I've posted many examples of various ink drawings and one of the keys of success is to do preliminary as well as tight pencil sketches, especially if you are new to the medium.
I often do several very rough pencil sketches to establish the composition.
When first starting to do ink drawings it's wise to also do a tight pencil drawing like the one above, to establish tonal values.
It's also a good idea to do a lot of pencil drawings from photographs before doing sketches outdoors or from live models. All this will help when attempting ink line art.