Professional Drupal developer to update existing site

General information for the website: marketing agency need web help
Kind of development: Customization of existing website
Num. of web pages/modules: up to 8/10
Description of every page/module: We have a client website which is built in drupal and we need help updating it.

Here is a list of what we want done;

*edit the css / site to make the site mobile optimised for Google (responsive)
* Add Keywords Development
• Update Headings Status, Code To Text Ratio
• Add Sitemap and update Broken Links
• Develop CSS and HTML pages
• Develop Image profiles and accessibilities
• Add Google Analytics / cookie policies
• Increase security around URL and access

I can email you separately the URL and SEO report we have done.

Please quote appropriately for the fixed cost to do it all and when can you do this.
Description of requirements/features: listed above
Extra services needed: Customization, Optimization
Extra notes: