Hello everyone, I have been reading the forums trying to gather the information I need but I'm more confused than ever

So many things to consider!
So far I have figured out the following:
Substrate: Power sand special bottom layer and Aquasoil Amazonia S from ADG-ADA
Lighting: 1 X 40watt power compact square pin
I still need:
Filtration: I currently have a power filter mini but no bio-wheel. I'm looking into canister filters. Can somebody recommend one and tell me where to buy it? Also, what other accessories do I need and can I buy a complete package.
CO2: No idea, I read about so many different DYI, compressed systems but I'm still confused as to what I need, how much to pay, where to buy it, and how to set it up.
If anyone could tell me a nice setup list with sites to buy that would be great help!
Also, if I'm missing anything let me know please!