We recently installed Mosaico (and Shoreditch Theme and FlexMailer) on our CiviCRM 5.4 Wordpress installation.
None of the required Mosaico menu items are showing up under Mailings or Administer>CiviMail
I've cleared caches, etc.
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Which version of mosaico did you use, because I had the same issue with mosaico 1.1 (described as stable on https://civicrm.org/extensions/email-template-builder), but actually it is not supported anymore and you should go with the 2.x releases.