planting 29g?

Whether you need or not co2 is determined by the light intensity. If you have too much light without co2 you will be an algae farmer. Often the case.

I strongly reccomend you to buy online for planted tanks, I've only found two LFS that are planted tank oriented and their prices are so high that I only use them in an emergency.

If is your first time doing this, please don't rush and read a lot.

Starting a tank fully planted is the way to go, get the plants form people here at TPT. Is way cheaper. I wish I knew that before.
As for substrate and fertilizers, I like inert substrates and dry ferts. But if you want to dose less and maybe avoid co2, then use an active substrate(has nutrients) and low light.

Please avoid liquid ferts, they are a waste of money. IMO and IME.

Oh, and get a good filtration set up, don't be short on that one big sunsun 304b $90 is fine. Get it on e bay.

I hope this helps to start, and welcome!!

I agree with buying plants online. I would either recommend checking out aquariumplants.com or better yet check out the swap and shop forum here. There's always people selling plants for a good price, if your not to picky you might even luck into a ROAK and get them just for the cost of shipping.

Lighting is a big deal too much and you will have algae every where. but you do things like raise the lights or put window screen over the top of your tank to help diffuse the light if you need to.

substrate you can spend as much or as little as you want. Its all personal preference too many options. Also matters if your going with stem plants or root feeders. Can always add root tabs to the substrate so that it has the nutrients the plants need.

Lastly read read and read some more. Trust me the more time you spend doing your homework the better chance you have of your tank turning out how you planned it. Also ask if our not sure lots of helpful people here. goodluck