Migrate simple WordPress site from version 4.9.3 to 7.01

Migrate simple WordPress site from version 4.9.3 to 7.01 Site Details: Menu Pages: 5 Posts: 43 Forms: 1 contact form Media: 50 images Links: 0 PHP files: footer.php + 7 more Comments: 0 Appearance: 1 theme Users: 1 Plugins: PixoPoint Menu Plugin (this may need to be replaced as it is no longer supported) All In One SEO Pack Gravity Forms I will also need guidance for the following: 1) exporting the site so that you can work on it. 2) best way to import your version 7.01 site to a staging site so it doesn't break the current site 3) best way to switch to the new site and the procedure to roll back to the old site in case of problem 4) procedure and frequency to upgrade wordpress and php versions in the future so i don't fall so far behind. Milestones: phase 1: export site for developer phase 2: migrate site to new wordpress/php version phase 3: import site into staging area phase 4: improve contact form look and feel using a new plugin phase 5: make site mobile friendly using a new plugin phase 6: any other improvements that you suggest for improving the site Let me know what questions you have in order to price the job