I give violin lessons for living, but I really like the idea of bartering and have done so in the past, on occasion.
The student will need their own violin. If you don't have one, I can recommend a place to rent one from, or of I have them in stock, I can rent one to you.
Student need not be a musician it a violinist to start. Absolute beginners are just fine. I'm a believer in adult learning.
Most of my students take one hour lessons weekly.