Hi ! welcome to the club. there are only some plants can live without co2 supply. example Anubias Nana and Java Fert. in your case, u plan to buy ada soil is just for lower down the pH value. if u intend to plan carpet plant like Japanese Hairgrass, glosso or even HC. forget about it, they are require co2 supply. however you can DIY co2 supply actually. all you need is just about rm10 for the material. 2 packs of sugar, pack of yeast ,few softdrinks bottles and some tubing.

or you can do something more interesting..



low tech aquarium.. very cheap very beautiful setup for those who likes el-natural approach.i have one aquarium like this that i setup at my balcony.. the system receive nutrient from natural sunlight. The plants will provide some oxygen and cleans the water efficiently.  the fishes looks healthy and i only use one small pump to add aeration and circulation.  I use water lilies, umbrella plant and other marsh plants.
i dont have the picture right now but here is where i take my inspiration from.. http://www.tuncalik.com/2009/09/biotope-in-my-study/

for smaller setup u can search for walstad method.. it uses the same philosophy.