New To co2 diffusion....

Hey guys,

Today i took my delivery of a rhinox 2000 difuser and a Gamba Bubble counter and wondered how i would go about setting these up in which order ?

i also got a galss check valve or what i think is a check valve its a glass tube with a red piece of plastic in and only lets air go one way !

i have done co2 before using 2 2ltr bottles and put the tube into the outlet of my filter but now i got this stuff i wanna set it up right away...

the bottles are ready to go....am i right in thinking i got to fill the bubble counter half way with water ? and keep it up a certain way to stop the water going backwards or into the tank ?

Thanks....