As for internal links at your site, I find what works for me is to use ‘dofollow’ BUT be sure you do not open a new window as it’s annoying to visitors to open a new page within your site.
I have at least 3 internal links at each page of my sites. 1 to introduce the next page, 1 to a Tier 2 or main page for that site (example main slots page from a slots article) and 1 to home page. IMHO, you can never have too many internal links and it offers suggestions to browsers for ‘the next move’ once they are finished with a specific page to keep them at your site. HTH