New fishkeepers tend to want a large variety of colourful, different looking fish, but not everything in the shops will be suitable.
Choose a good aquatic shop with informative labels and always ask for advice. Write down the make and model of your tank, and how many litres or gallons it holds.
Do your own research as well as asking advice from retailers. Read books and PFK to give you an idea of the sort of fish you wish to keep, and try the hardiest fish first.
Don’t be tempted by juveniles of big fish. If your tank won’t house them at an adult size, don’t buy them.
Aim to keep community fish first, as these often stay small, and are easy to keep. Non-community fish may be large, predatory, aggressive, or all three, and are not good for beginners.
A community of small fish offers you the most choice, and you will be able to fit more of them in your tank than any other fish.