I've been trying to use co2 myself the way you are thinking about giving it a go. What I found out was that there is a significant increase in room temp and you don't know how much co2 is being dispersed.

The increase in heat outweighs the benefits of added co2, the plants get really stressed. So have the means to keep your room at the right temp.

Used the syringe co2 meters to check levels but the are only giving you an "at the moment" indication. After having to fill up tanks every few days, losing plants too stress I finally bought the proper stuff.

1 x PPM-1c CO2 Monitor / Controller (PPM-1c) = $399.95
1 x CO2-2e Climate Controller / CO2 Timer (CO2-2e) = $269.95

Excellent kit, defenitely worth the money. And of course a regulator with solenoid valve $150.

Give it a go with your primary plans, sometimes it's best to find things out by yourself. But starting with co2 is a whole different altogether.