Patience dedication, and the want for more knowledge will get you very far in this hobby. Find reputable dealers, or deal with trusted online sources, don't be shy to question the motivations of those you buy things from. Ask before you buy, everyone here knows far more than any single person put together. Take time and put effort into keeping up with testing water params, doing changes, and adjusting to give your fish and other animals the best possible conditions, happy fish make this hobby much more enjoyable. Never try quick fix medications or other solutions to common problems, some may work, others may cause you to lose everything, again ask before trying products. Other than that just love what you do and enjoy the ride.