Hi Diascream! If you’re just starting out, I would recommend learning everything you can and practice every chance you get! There’s plenty of free videos on YouTube, there’s DVDs you can buy and watch multiple times. Also check around locally to see if there are any clubs or classes you can take. Even the Wilton classes are a good start.
As far as making a living selling cakes, there’s a lot more involved. My husband told someone once that it was like saying “I like to drive fast, I want to be a NASCAR driver!” Work on building your skill and experience level, and then look to see if there are any small busines administration (SBA) classes in your area. You should also check with your local health department to see what the laws in your state even allow.