Sophia here from Shopify. Welcome to the Shopify Community, and congratulations on starting your store!
@dropship_helps is absolutely correct—you can sync products from multiple suppliers. There are a few different apps that help you easily import AliExpress products to your store. I recommend starting with Oberlo. They've got a ton of resources on their website including articles, tutorials, and courses to help you along your entrepreneurial journey.
Keep in mind that when you're dropshipping, especially if you're working with multiple suppliers, you'll typically be working with either a free shipping rate or a flat shipping rate. This is because we don't often know which carriers will be used once a product reaches its destination country, so we can't guarantee the carrier or the timeframe with calculated rates. I'm happy to discuss product pricing and shipping strategy with you if you have any questions.