feeds

You mean the link to your feed. You can add it to your theme templates (most usually place it in the sidebar) by using something like this:

<a href="<?php bloginfo('rss2_url'); ?>" title="Syndicate this site using RSS2">RSS</a>

The default theme’s sidebar.php provides a good example of the typical “meta” section, so you could copy that over to yours.

I can’t really answer that, as I don’t know [A] how you intend to use your blog, and [B] what type of visitors/readers you want to attract (if any) and how they will go about accessing your blog’s content.

Here’s some material on site syndication (focused on WP) that should help you decide if you want or need it:

http://codex.wordpress.org/WordPress_Feeds
http://wordpress.org/support/topic/39178