My DIY CO2 is working

This is how i did (i following the steps exactly that i read from the internet and forum):

1) 1 x 1.5L bottle
2) Add 2 cups of sugars
3) Fill up warm water to 3/4 of 1.5L bottle
4) Shake the bottle
5) Add in 1/2 teaspoon of sodium bicarbonate
6) Shake the bottle again
7) Add in 1/2 teaspoon of Yeast (do not shake)
8) Result after 4 hours