It's great that you are going the DIY path with HHO. It seems like you already know the next step to take though -read some more.
There is a lot of very good info available here, so don't hold back. Read other posts like yours and you'll see what's lacking.
On another note:
- Do not allow the water to pass the top of the plates.
- Use Distilled Water instead of tap.
- Mix in 1/4 Tablespoon of NaOH (caustic soda or drain opener) at a time to see more bubbles. Be careful with NaOH - use plastic gloves!
- Use -NNNN+ as your config. (Does not make much difference if the water in the container is flowing around all the plates, giving them the same amount of voltage.)
Recommended reading:
http://2hho.com/hho_plans.htm