Unfortunately, this site has nobody from the company who will help. I try my best, without being paid.
It is okay that you haven't played Epic Mickey before. The game slowly teaches you how to jump, double-jump, spin, paint, and thin.
In Epic Mickey 2, the Vita uses mostly touch screen, but you can choose to aim with a button or touch screen.
Links for Controls of PlayStation Vita:
Users Guide
http://manuals.playstation.net/document/en/psvita/
1) Plug in the A/C adapter for awhile, to fully charge the battery.
2) Press and HOLD DOWN THE POWER BUTTON for 5 seconds, the first time you turn it on.
3) On occasion, touching the lower part of the screen will bring up menus and buttons.
4) To turn it off, press and hold the power button for two seconds. Then, tap the off button on the screen, when it appears.
5) If you want to use buttons instead of tapping the screen, set it in the options. You must first tap the (Settings) > [Start] > [System] > [Control with Buttons on PS Vita System] checkbox to set a checkmark to allow control with the buttons on the PS Vita system. After the control is enabled, when you press a button on the PS Vita system on a screen that supports button control, a cursor will appear on the screen.
In Epic Mickey 2, you use mostly touch screen.
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http://psp.about.com/od/hardwarefirmware/a/Intu-Aim-And-Other-Ps-Vita-Controls.htm
Using either touch screen or the usual buttons.
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YouTube videos taken at an expo, showing Epic Mickey 2 on the PS Vita
http://www.youtube.com/watch?v=cAuCm9QlS40
http://www.youtube.com/watch?v=PK75SRpJ6QE