I don't find private site collection under the menu site collection ,I have trial version is that the problem?

hello.

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I am trying to learn office 365 through the book  office 365 for dummies, in the excesise of setting up the intranet with publishing the excersise telling me click new under the site collections menu and select private site collection and so on .  the problem is I don't see any private site collection under site collection menu.   I have at this moment trial version of office 365 for30 days for small bussiness P1. what is the problem here.