The lesson notes are Word or PDF documents. Problem pages can be similar, or can be Excel or similar format, to allow the student to work interactively.
The lessons would be customised, based on the students needs identified in the first (or first few) lessons.
Feedback based on the problems sent previously, could then be used to modify subsequent lessons.
My previous experience includes a BSc in Astrophysics, an MSc in Opto-electronics, and working as a research assistant and then technician, providing face-to-face support to students, either one-to-one or in small groups.