You will need:
Wash hands and take precautions to avoid breathing potting mix dust.
For more information see World Health Organisation
Growing your own beans in a PET bottle can be a lot of fun, but you can also use these beans to investigate factors that affect plant growth. Try setting up different bottles and changing one thing to see the effect (eg. the amount of water or light they get or adding salt to the soil). Changing one variable and seeing the result is part of the scientific method and we strongly encourage it!