Here are the top mistakes to avoid when starting an online business:

1. Failing to research and validate your business idea
2. Not having a clear target audience and customer profile
3. Ignoring your competition
4. Not having a solid business plan in place
5. Neglecting your website and online presence
6. Overestimating your budget and underestimating costs
7. Failing to build your email list and customer database
8. Trying to do everything alone without outsourcing or hiring help
9. Not being flexible and adapting to change
10. Giving up too soon without giving your business enough time to grow and succeed.

Factors to consider when launching an ecommerce business:

1. Choosing the right ecommerce platform
2. Creating a mobile-friendly website design
3. Offering competitive pricing and promotions
4. Providing quality customer service and support
5. Building a strong brand reputation through online reviews and social media presence
6. Offering a variety of payment and shipping options
7. Optimizing your website for search engines and driving traffic through paid advertising and social media marketing
8. Implementing strong security measures to protect customer data and transactions.

Tips and strategies for starting an online business:

1. Conduct thorough market research and validation before launching your business.
2. Develop a strong brand identity and differentiate yourself from competitors.
3. Build a website with user-friendly design and functionality.
4. Focus on customer acquisition and retention through targeted marketing efforts.
5. Offer valuable products or services at competitive prices.
6. Create a content marketing strategy to drive traffic and engage with customers.
7. Establish a strong social media presence.
8. Continuously collect feedback and user data to improve your business.