Hello!
We have extensive experience with Wordpress and can definitely help you with your project.
Our answers:
1) We have 7+ years of experience with Wordpress
2) The great theme is Mindig. It's a lot of plugins for website.
3) We have great experience with WPML. We can help you to insert translations for your website.
Our skills: CMS Wordpress, HTML, CSS, Javascript, Jquery, Bootstrap, Php, MySQL, Adobe Photoshop, Illustrator, etc. Please, you can see our portfolio here https://www.freelancer.com/u/Webln .
Please, write us to start discussion of your tasks.
With thanks,
WebIn team.