How to start creating web application ?

Question

Designing a web application.

Answer 1

1 - Planning the App: Basic Idea and Design
2 - Planning the App: Database Architecture and Development Approach
3 - Designing the App: Workflow Map and Photoshop Design
4 - Designing the App: HTML and CSS
5 - Developing the App: User Interaction
6 - Developing the App: Adding AJAX Interactivity
7 - Developing the App: List Interaction
8 - Security & The Future

css-tricks.com

Answer 2

install a web server on your pc maybe start there so you can test anything you build?