I no longer teach classes , but drawing lessons for "One to One" or groups up to three would be possible at my home in Ecclesall, Sheffield.
Lessons on drawing on the iPad
in addition I am also contemplating offering lessons (in the same formay) on using the iPad for art work.
When drawing/painting digitally I use the app. "Art Studio" and the newer version "Art Studio Pro" (examples on my "Digital Page") and so I am most familiar with these programs.
Therefore the lessons would be based on these apps, although the techniques are transferable to most "serious" art apps.
Cost = £15 an hour for "One to One", £10 an hour (each) for groups.