How do I start to develop my website?

There are plenty of options to start developing your website.
From Scratch:

For Static Website -
You should be knowing

1. HTML
2. CSS
3. JAVASCRIPT

For Dynamic Website -
You should be knowing

1. HTML
2. CSS
3. JAVASCRIPT
4. JQUERY
5. PHP
6. MYSQL
7. How to create RESTFUL API SERVICES

For E-Commerce Website -
Here you have a lot of options. You can develop it using CMS Software like

1. Magento
2. Opencart
3. Prestashop
4. Shopify
5. and many more in the list or you can build it from scratch.

For Blogging Website -
You can develop it from scratch or other options are :

1. Wordpress
2. Wix
3. Blogger
4. Weebly

PS: It all depends upon your convenience and how you want to develop your website. I have listed all the starter and advanced options for you.

Wish you luck for developing career Pal!