Check this link to see possible essay structures:
http://www.ego4u.com/en/cram-up/writing/text

  • This is useful for OPINION ESSAYS:
http://www.ego4u.com/en/business-english/communication/opinion

Stating your opinion, your agreement or disagreement:
http://www.englishclub.com/speaking/agreeing-disagreeing-expressions.htm
The same but with audios to listen to:
http://www.englishpond.com/speaking/Communication%20and%20daily%20English/agreeingaudio/

So am I /Neither am I; so do I /neither do I :
http://www.eslgold.com/speaking/ss_agreeing_disagreeing.html