You could use polymer clay! Its safe, nontoxic, and can be cured at home in your regular oven. The Blue Bottle Tree is a wonderful source of tested, accurate information for all things polymer clay. Here (https://thebluebottletree.com/polymer-clay-information-articles/) is an overview of some of the most helpful posts. These ones will probably be most helpful to you as a newbie for these kinds of projects: Tips for Beginners (https://thebluebottletree.com/polymer-clay-tips-beginners/), What’s the Best Polymer Clay Brand? (https://thebluebottletree.com/best-polymer-clay-brand/), How to Buy (https://thebluebottletree.com/how-to-buy-polymer-clay/) (Sunny Day Crafts (http://sunnydaycrafts.com/claytools.html) is my recommendation for clay), and Using Silicone Molds (https://thebluebottletree.com/using-silicone-molds-polymer-clay/)
The big thing to watch out for with polymer clay is that there's a TON of downright wrong information out there. Because its so readily available so many people buy cheap poor quality clay, make something, and consider themselves an expert. So many tutorials are wrong in ways that will cost you time and money.