Yes. I have resisted responding because I don't want to share my knowledge.
It could be because I was busy. Or had the flu. Or both.

Or because CO2 is the last thing you should be worrying about if you are a noobie. The atmosphere has more than enough for your plants as long as your ventilation doesn't suck. Concentrate on getting everything else perfect before you fuss with CO2- read up on the concept of the 'limiting factor'...

CO2 tank- Tubing only needs one hole- the one in the end. Tape it to your oscillating fan that you already have in your grow room. Read Rhizome's growroom setup sticky. It's all explained clearly, with the volume/leak time/pressure calculation.

Dry ice- Get a heavy duty large plastic cooler. Drill a few 1/4" holes in the lid. Put the dry ice iin the cooler. When it is gone, put more dry ice in the cooler.

Vinegar/baking soda- Get a gallon of distilled vinegar. Take a fridge lemonade dispenser with a spigot built in, and rig it so it drips just a few drops per minute. Put the vinegar in it and put it on a shelf. Below it, take a stainless steel stock pot and put a mound of baking soda on the bottom. Put it under the vinegar. When either the vinegar or the baking soda run out, replace them.