Ok for starters, welcome to the forum
And if your referring to a pressurized Co2 system, I can help out abit there.
First of all, Co2 injection is unnecassary for low lighted tanks eg. t8/t12. This is because the plants aren't receiving much light, causing photosynthesis to occur. When photosynthesis starts to occur, then the plant starts to grow, needing our equivalent of oxygen, being Co2... With high lighting, and no Co2, your plants will start to choke to death, from lack of air.
Low lighting certainly limits the types of plants you can get quite significantly, although there are plants that will thrive in these conditions. eg. Java moss, Java Fern, Duckweed, Cardamine, just to name a few...
It would be better if you had at least t8 for these plants, and I reccomend you get it, i'm not so sure your "type A" bulb will suffice.
Always best so you know, to get the plants organised first before putting the fish in, because it means that you won't be messing around with their environment very often, which they wouldn't like you doing anyway, so good choice...
Hope my information helped