How To Resize A Mask and The Image Inside Of It.

[Kyle Meyers]

My Other Video Is Bigger Than The Second Video, So I need To Resize my mask to the size of the second video. How Do I do this?

[Justin Taylor-Hyper Brew]

You'll probably want to use a track matte. Can you post a screenshot of your setup?

[imeilfx]

Please send us more info, many a screenshot of your workflow. There an be several ways to reach what you need but without knowing exactly - it is hard to recommend something specific. 
F.eg. In your tittle you are asking how to resize mask and layer/image inside of it - here is straight forward answer - just sale your image and mask should scale with it.
But if you wish to scale/resize just mask on a first image - just double mouse click on mask handles and sale with your mouse. 
If you can't see mask handles just press Shift+Ctrl+H