I suppose that will work.
The first step is to develop a lesson plan for what you're gonna teach. keep in mind that you will have different levels of "students". Personally, what I do is start at the very beginning (Beraishis barah J. Presper Eckert in 1946 es haENIAC...) and explain what computers can do and, more importantly, what they CAN'T do [which is basically anything they weren't TOLD to do]. Even computer savvy people need a refresher once in a while. There is nothing too basic.
The manager of a company called me up hyperventilating that all the computers in a room were blank and they had tried everything. When I showed up I found that the power strip that they were all plugged in to was off. Someone had kicked it by accident. Basic, but billable
Networking is also important. Include in your lesson plan what a network is, how the internet works and why some websites can be slower than others.
Anything that you don't know the answer to, find out. Do research. Read, read, read. Don't make stuff up. It's okay to say "I don't know" but it's WAY better to come prepared.
IMPORTANTMake sure your lesson plan is time effective and interesting.
The next step is to find a small company that you have an "in" with (family, friend, etc) that you can provide the service to for free or for very cheap. Get your name out there. Water cooler banter and after-hours drinks are the ways for your students to circulate your name to employees of other companies.
Good luck.