If i were drawing shading, The smudging process and everything. What Pencil would be required?

I'm bound to go with a 3B but i dunno if its the right one to use.

While the softer B pencils are generally considered the best for shading, there's no reason to discount the harder H pencils. The HB and H are good choices for fine, light, even shading. However, they too have drawbacks. Pencil grades from HB through H, 2H to 5H get progressively harder and are easier to keep sharp. I usually use B though so I recommend that :D