Online Tutoring

I have been toying with the idea of online tutoring but not sure whether I should even start.
Below is a brief outline of my online tutoring plan (tentative).

Is this option viable?

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60 credits for US$20 (international, hence USD)

Type of tuition	Maximum no.	Credits per min	Credits in 2h session
Group	8	3	2880
Private 1-1	1	6	720
Time-tabling
Subjects	Level	Day	Time (Singapore)
Add. Maths	Upper Sec	Wednesday	7- 9 pm
Chemistry	Upper Sec	Sun	7 - 9 pm
General Science	Lower Sec	Sun	10 - 12 pm

Requirements
- 1 headset with speaker piece
- 1 webcam
- 1 tablet for writing (in the future)

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Your comments please.