Help:Starting a new page
There are several ways to start a new page.
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From the search page
If you search for a page that doesn't exist (using the search box and 'go' button on the left of the page) then you will be provided with a link to create the new page. (Note that this technique doesn't work if you use the 'search' button).
Create redirects to your new page
Don't forget to setup redirects when you create a page. If you think another person may search for the page you've created by using a different name or spelling, please create the proper redirect(s). See Help:Redirects
Protecting your new page
Normally a new wiki page can be edited by other people (that is one of the main ideas of a wiki!) However, you could 'protect' the page, if desired, to prevent normal users from editing it. This requires sysop permissions.