First things first, what size tank, and how much lighting? If you have the stock strip light that comes with a lot of aquariums, it isn't enough light to grow plants. Before you spend any money, read Rex Grigg's guide--it will help you understand what you need and why. You don't have to have high light and CO2, you just have to plant your tank with plants that don't need those conditions. Anubias, java fern, mosses all do well with low light. But these are slow growers, and you need fast-growing stem plants to get your tank cycled properly. You can get anacharis and bacopa at most big-box stores, but make sure it is a fresh shipment, so the plants will be as healthy as possible. Better yet, when you are ready, post in Swap n Shop to buy fast-growing stems for low light. You will want to plant at least half your tank with these fast growers to start with, and later on you can replace them with the slow-growing plants (again, best place to buy IMHO is the Swap n Shop).
Welcome to the forum, and be sure to read the postings in the Low Tech forum, which it aimed at low-light, low-maintenance tanks. Here's a link to Rex's site:
http://rexgrigg.com