Hey!

This should help you get started...

There are various parts to your service and they should be considered as separate services:
1. Create the Wordpress website (one-time)
2. Create content for the blog (recurring)
3. Social Media Management (recurring)
4. YouTube account managment (recurring)

Each of those should have its own price, for example: $3,000 dollars for the website design and setup (this will vary depending on your experience and how much it will be worth to your client). Websites range from the very low end to over $100,000 dollars depending on what they do and what they will be used for.

The other three services are recurring services that should be paid in a monthly basis because it implies constantly adding content.

You should practice your skills as soon as possible to start getting better at each. That way you will start seeing how much time and effort it actually takes you and eventually you'll find the correct value for your work.

I hope this helps you, let me know if you have any additional questions!

Cheers!