My first step would be to understand your business needs, such as the purpose of your web application, target audience, and specific features and functionalities that you need. Next, I will offer recommendations on the most suitable technology stack for your web application. This will involve the selection of programming languages, databases, and frameworks that are well-suited for your specific use case. I will take into account scalability, performance, ease of maintenance, and development cost to ensure that the technology stack we recommend aligns with your business goals. Finally, I will provide you with a detailed estimate for the development of your web application. This will include an itemized breakdown of the cost and timeline for each phase of the project.