Is it illegal to sell keyblades?

I'm a local artist who designs keyblades and custom made keyblades, along with various type of cosplay items and props. I was wondering if it was illegal for me to sell my creations to people and online. For reason such as, the designs or names are copyrighted or trademarked. I don't want to cause any trouble, just trying to start up a business. If anyone could give me any information, that'd be stellar! Thanks!