Hi Nix
I sent an article to Cees (webmaster) on setting up a tropical aquarium. A very simple basic guide. He promises to add it to the articles section as soon as possible (another reminder here Cees! ).
Get dark gravel. The fish feel more secure and their colours show up more. Light gravel washes the colour out of them. White gravel is for marines.
You should not have to condition your water with anything. If chlorine is added to the water in your area, letting it stand overnight is enough as the chlorine will dissipate and be gone by morning.
Check out the clubs list (click on the fnzas.org is here logo at the top of the page) for the nearest club to you.
If you join a club first, they will help you set up your aquarium right the first time (and probably help you with a few fish or plants too). Most clubs also have their own libraries so you can read up on aquarium requirements.
Good luck.
Remember, don't rush the process, or things will go wrong.