As a beginner crocheter, it is recommended to start with a medium-sized crochet hook, such as a 5mm size H. This size is a good middle-of-the-road size that will help you get used to the basic crochet stitches and is versatile enough to work with different types of yarn. It is also recommended to pair this hook size with worsted weight yarn. Some beginners may prefer metal-tipped hooks with thicker, ergonomic handles, as they can help avoid wrist pain and make crocheting a little faster. It is important to choose the right hook material that works best for you, whether it be plastic, aluminum, bamboo, or another material. As you gain more experience and confidence, you may want to experiment with different hook sizes and materials to find what works best for you.