I know what you mean about the pet store. The best first thing you can buy at the petstore is a book on fish care. Read up. You'll understand more and get confidence. Ask me as you read. I have a little book on the importance of clean water for Betta fish. You can see it in the e-books here at Bellaonline.com. This principle applies to all fish - the importance of clean water. It's just that, as you can begin to see from these posts to you about the betta fish, there are a few specific fun facts to know about betta fish first before you become a new betta fish pet parent.