Opening an online store can be a great way to start a business or expand your existing one. Here are some basic steps to follow and an estimate of the costs involved:

Choose a platform: You'll need to choose an e-commerce platform to host your online store. Popular options include Shopify, WooCommerce, BigCommerce, and Magento. The costs for these platforms vary, but you can expect to pay a monthly fee starting at around $29/month for basic plans, and up to $299/month for advanced plans.

Register a domain name: You'll need to register a domain name for your online store. The cost for a domain name can range from $10 to $50 per year, depending on the registrar you choose.

Design your store: You'll need to design your store and create a visually appealing layout that showcases your products. Many e-commerce platforms offer customizable themes and templates, or you can hire a designer to create a custom design for your store.

Set up payment processing: You'll need to set up payment processing so you can accept payments from customers. Popular payment processing options include PayPal, Stripe, and Square. These platforms charge a fee per transaction, typically ranging from 2.9% to 3.5% plus a fixed fee per transaction.

Add your products: You'll need to add your products to your online store, including images, descriptions, and prices. Make sure your product pages are optimized for search engines to help customers find your products.

Launch your store: Once your store is set up, you can launch it and start promoting your products through various marketing channels.

The total cost for opening an online store can vary depending on the e-commerce platform you choose, the cost of any design or development work, and ongoing expenses like payment processing fees and marketing costs. However, you can expect to pay at least several hundred dollars to get started.