I was told to preview my tax forms prior to filing, but don't know how I'm able to do that. Where can I find these forms?

You should always review your tax return before you file.  Before filing you can preview the 1040 or print the whole return
https://ttlc.intuit.com/community/accessing/help/how-do-i-preview-my-turbotax-online-return-before-filing/00/26160