I am using the Yoast Wordpress SEO plugin and would like to know if I need to insert meta tags into the head of my document or will Yoast do this for me assuming I've filled out the required fields in the back-end? Do I still need default meta tags or will Yoast be injecting its own?
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It will use what's in your theme to write the meta tags.
Just enable meta tags in the yoast options as by default this is OFF and then go view your site.
However you'll also need to set something for the Meta field from the Post tab
You can also choose the option to force titles if your concerned