best thing to do at this point is head to
www.rexgrigg.com
Read what Rex has to say regarding planted tanks since his info is very helpful.
I'm not entirely sure but I don't think there is a "package" that you can buy from a store without getting ripped off. All you need is a Co2 tank, regulator, some sort of reactor/diffusor, and drop checker, and patience.
I bought my Co2 tank from
www.beveragefactory.com
Their prices are unbeatable
I bought my regulator and reactor from Rex for about 150 or so. There are other people who build them and sell them so prices vary...be sure to shop around.
I have a PVC reactor that is connected to my ehiem filter so the Co2 in injected into the reactor and "dissolves" within the column of water. It works for me but there are other ways to do it.
The drop checker is a good way to determine how much Co2 is present in the tank but its not 100% accurate. You will need to buy or make 4 Kdh water and some pH reagent. I have one but I know that in my tank, its not accurate because I have extremely high KH. So in my case, my drop checker (with 4 KdH water) is bright yellow but the plants are pearling fine and the fish act like nothing
I know this is a lot of info but I hope it helps you in some way...
