website re-write and increase security - repost

1. i have a website that is hosted in a name and i change the name to a new one so i need to re write the site with the new domain 2. i need to re write with an attention to have a clean tags for search engine optimization 3. i need to enhance the security of the site when re written it 5. if you can upgrade the prestashop at once so when we re-write the site on the new version along with the new upgrade it is a plus if it can be done 6. i need to add the functions that some products we need to publish without price ???? so i need this option to be added. we will discuss the plan and what we need by exchange email before you bid so we can give you the site address to check waiting