Hello, Sat!
You have a good idea to start! It's really great that you recognize the for an independent and dependent variable. I'd suggest that you keep the method the same to ensure that you have controlled data. Instead of changing the method, you could change one variable to measure its impact on the dependent variable. If you agree to this, I'd suggest changing a concentration or amount of a chemical as the independent variable to see its effect on paper quality. Paper quality can be measured via a paper quality test, some of which are described in the following links:
https://en.wikipedia.org/wiki/Paper_and_ink_testing and
http://www.intertek.com/paper/testing/.
You'll need to do some research into any equipment and materials for the proper amount, but here is a rough idea of the general procedure for making paper out of grass.
1. Cut the grass and grind it with the mortar and pestle
2. Add caustic soda to release the cell contents
3. Wash and rinse to remove chemicals and cell contents
4. Add bleach and bring to the boil
5. Wash and rinse to remove the bleach
6. Form the paper
This is a link from a similar project several years ago:
viewtopic.php?t=8135. You should read the responses for more research.
I hope this helps, although this was a just a general briefing for your experiment. Have fun researching, and keep asking questions as they come up. Good luck!
Kayli Masuda
