RSS Feed issues for podcast

Can anyone help with this? I'm new to rss feeds and not sure what's wrong with the feed. In short, I can plug in the URL feed on iTunes if I use File/Subscribe to Podcast, and the 4 episodes I've posted will download. However, the episodes will not show up on iTunes Store or the Podcast app.

When I entered the rss feed in the Feed Validator I got the text below:

This feed does not validate.

• line 3, column 1930: Undefined channel element: itunes:type [help]

  ... ory text="Investing"/></itunes:category><itunes:type>episodic</itunes:ty ...
  ^

• line 7, column 4026: Undefined item element: itunes:episode (4 occurrences) [help]

  ... 17590621204/1500w/GMR+EPISODE+3-1.png"/><itunes:episode>4</itunes:episod ...
  ^

• line 7, column 4060: Undefined item element: itunes:title (4 occurrences) [help]

  ... png"/><itunes:episode>4</itunes:episode><itunes:title>GMR 4 Financial Se ...
  ^

• line 7, column 4141: Undefined item element: itunes:episodeType (4 occurrences) [help]

  ... Life and Common Questions</itunes:title><itunes:episodeType>full</itunes ...
  ^

• line 7, column 4186: item contains more than one content:encoded (4 occurrences) [help]

  ... es:episodeType>full</itunes:episodeType><content:encoded><![CDATA[]]></c ...
  ^

In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendations.

• line 3, column 3: The prefix "media" generally is associated with the namespace "http://search.yahoo.com/mrss/" [help]

  --><rss xmlns:content=" http://purl.org/rss/1.0/modules/content/ " xmlns:wfw=" ...
  ^

• line 20, column 3894: Missing atom:link with rel="self" [help]

  ... ife</media:title></media:content></item></channel></rss>
  ^

Source: http://leo-sabo-cjst.squarespace.com/gettingmoneyright?format=rss