Based on the information you provided, it seems like you have a good foundation and mindset for starting an e-commerce business. Here are some points to consider:

1. Utilizing Your Digital Marketing Skills: Your experience in paid ads, Google Ads, LinkedIn Ads, and SEO will definitely give you an advantage in promoting your e-commerce business. Understanding how to drive traffic and optimize your website for search engines is crucial for success.

2. Market Research: Conducting thorough market research is essential before deciding on a niche. While pet-related niches can be profitable, it's important to analyze the competition, target audience, and potential demand. Look for gaps in the market or unique selling points that can differentiate your business.

3. Starting with Low-Risk Products: Starting with pet accessories is a good choice as they are relatively low-risk products with a potentially high demand. However, it's still important to analyze the market and competition within this niche to ensure profitability.

4. Sourcing Products: Importing products from Alibaba may not be the most cost-effective option due to high shipping rates. Exploring local suppliers who can provide competitive prices can be a good alternative, especially if it saves you on shipping costs. This may limit your product options initially, but as you generate earnings, you can consider expanding your product range by importing.

5. Building Your Website: Using WooCommerce with a WordPress template is a popular choice for e-commerce businesses. ThemeForest offers a wide range of customizable templates that can help you create a professional-looking website. Make sure to focus on user experience, mobile responsiveness, and easy navigation to enhance customer satisfaction.

6. Payment Integration: Integrating a reliable and secure payment service is crucial for your e-commerce business. Choose a payment gateway that is widely used and trusted by customers in your country to ensure smooth transactions.

7. SEO and Marketing: After setting up your website, investing time and effort into SEO will help improve your visibility in search engine rankings. Focus on optimizing product descriptions, meta tags, and generating relevant content to attract organic traffic. Additionally, consider implementing other marketing strategies such as social media advertising, influencer partnerships, and email marketing to drive more sales.

While your plans seem realistic, it's important to be aware of potential challenges and risks. Here are a few things to consider:

1. Competition: The e-commerce market can be highly competitive, especially in popular niches like pet accessories. Ensure you have a unique selling proposition or find a specific target audience to differentiate yourself from competitors.

2. Logistics and Fulfillment: As your business grows, managing inventory, shipping, and customer service can become challenging. Consider how you will handle these aspects efficiently and ensure a smooth customer experience.

3. Cash Flow: Starting an e-commerce business requires some initial investment, and it may take time before you start generating significant profits. Plan your finances accordingly and have a backup plan in case things don't go as expected.

4. Adaptability and Continuous Learning: The e-commerce landscape is constantly evolving, and staying updated with industry trends, customer preferences, and new marketing strategies is crucial for long-term success. Be prepared to adapt and learn from your experiences.

Remember, starting an e-commerce business requires dedication, hard work, and continuous learning. While there may be challenges along the way, with the right mindset and strategic approach, you can increase your chances of success.