Starting an online selling business in the Philippines involves several key steps. First, identify your niche and what products you want to sell. Next, set up an online store using platforms like Shopee, Lazada, or your own website. Then, source your products and establish a reliable supply chain. Additionally, focus on digital marketing to reach your target audience through social media and online ads. Finally, ensure you understand local regulations and tax obligations; consulting with a professional can help you navigate this process effectively.