Clean all your equipment in boiling water
Use either brown rice flour or grind your own in a blender
I used a Nutri-bullet which worked well and ground 250g at a time
Add 1 part flour to 1 part water and mix in the container with a non metal spoon
Cover with a loose cap or coffee filter secured with elastic band
'Feed' the starter morning and night for 3-5 days until it doubles and you can see the bubbles
You should find the starter increases in size and with layer of water sitting on the top, discard this before feeding
After at least one discard step you are ready to use your starter
To store, keep the starter covered in the fridge and feed once a week