Website review and SEO

General information for the website: We sell Training and consultancy services in Food Safety and health and safety
Kind of development: Customization of existing website
Description of every page/module: I have a home, food safety, health and safety, training courses, etc. What I want is someone to re brand an existing website that works quite well at the moment but it looks dated. I also need content review for another website which has been designed, looks good, but not performing on SEO.
Description of requirements/features: I just need a refreshed website that looks modern. My current site looks dated. Some content change to bring it up to speed and also some SEO for another website.
Payment methods: Specific Payment Gateway
Extra services needed: Optimization
Specific technologies required: ?
Extra notes: as above I really don't understand these terms.