It's alright, we're all new to things sometimes
. Most live plants are just a little more expensive than fake, but they also help out your tank alot more. You can buy a light if you want, but the problem with that is algae grows faster on your plants if it's in the light for a good portion of the day. I'm sure the light from your window would be fine. You can buy plant food to help it grow faster and more colorful, or you can let it grow on its own, that's your decision. Maintanence for live plants depends on the live plant. I suggest you do a little research before you begin to buy your plants. Good luck with your tank!