I really want to start creating professional mockups for my branding projects and for my portfolio but don't know how to create perspective like this.
The fastest way would be to use the perspective grid tool in Illustrator and import the shapes into Photoshop as smart objects.
To do it only in Photoshop, I would use the Perspective transform tool.
From there you just adjust as needed. It may also help to adjust with distort as well since it has a bit more freedom than most of the other tools under transform in my opinion.
Hope this helped.