The Pencil First!
F (fine and hard) to stimulate the basis of the subject,
2B (black, soft), to begin shading no matter in detail or not
6B (dark black, extremely soft) to affix depth and contrast.
The softer the pencil the easy way to smear and bring result of as per my requirement! These are blacker that it helps me to bring depth in my work. You can buy tins or sets of drawing pencils sensibly cheap till remarkably expensive from any art store for 8 pencils from Derwent, different levels of H2 (hard), F, HB, B, B2, B4, B6 and B9. But there is no comparison of my good old HB. You can find bit hard results from HB especially good in producing wooden effects.