Modification for a Freelance/Classified ads website

I need to modify the functionality and interface of my freelance/classified ads style website. It is on Joomla and is currently live and functioning. Please get in touch if you have extensive knowledge and experience in Joomla, PHP and MYSQL. The main aspects that need to be focused on are as follows: Change of background colour to plain white; add a transparent overlay to the modules (i.e off white) ensuring all colours work well for the new design. Create a ‘How it works’ section, idiots guide really with animation where necessary to cover how to post a job, how to find a job, how to get paid, how the website operates etc. Blog area in communities section where users can submit an article after being authorised by admin first and will be mainly used to post articles by guest writers to enhance search engine ranking. A support page to be associated with help menu, where questions and answers can be posted in a presentable manner and an easy to navigate format, easy to read and follow, with a share link. Email newsletter sign up option so that we can bi-weekly or weekly newsletters to subscribers There are a few more changes which we can discuss in details. I look forward to hear from you soon. Thanks