I always like to recommend "The Strategy & Tactics Of Pricing" whenever someone has a pricing question. It`s a great book, really fascinating.
Writing a blog is writing. Developing the blog is development. SEO optimization is another line of work. If you`re providing integrated services, you probably can`t charge an hourly rate equal to the total cost of employing separate professionals. Do you have any idea how much your friend makes per hour? Charge 20% less per hour for your services. Just an idea.
Charge him $150 dollars a month, no less. If, that is not enough, charge him up to $2,000 a month but no more.
Keep us posted on the outcome.
I think you might need to find comparables. How much are people being paid for similar work? Unless you`re very specialized or uniquely qualified, blogging and web work are commodity products. You can earn a lot more than $2000 per month only if you have clients who are willing to pay more than $2000 per month. I get the feeling - and I might be wrong - that you and the market could have very different ideas about what your services are worth. What number did you have in mind? $5000?
I would recommend that you price yourself between $30 to $40 per hour. This way you can earn a living and still be charging a fair rate for services. rendered. After you finish your first project, take a step back and evaluate. Hopr this helps.