This is a selection of tutorials available on the web. I have tried to find ones that seem to be free. I am not associated in anyway with these sites. As I find suitable sites, I will place them on this list. I will in near future be posting tutorials at https://comics.veeaahh.com
A demonstration by Joe Cartwright in pen, ink and brush.
A fantastic website where Karl Dixon generously shares how he creates his work, but also you can view his comics.
A youtube tutorial in using pen and ink with a nib.