Buy a large tank as theyre more stable than small tanks, contrary to popular belief, large tanks are actually easier to look after than small tanks.

Also buy the largest external filter you can afford, one designed for a much larger tank than you actually have, this means it will be overfiltered and as a result will make water changes and housekeeping duties minimal, which is better for you and the fish.

Dont overstock the tank with fish and be careful how much you feed the fish as its easy to get carried away and feed them too much and too often when youre new to fishkeeping.

You dont need to do water changes on a weekly basis, get some test kits and change the water when the nitrate levels start to show.

Before buying anything have a read up on cycling an aquarium so you know how to do it and what things like pH, ammonia, nitrite, nitrate are and how they affect your aquarium. Dont rush it!