I’m creating a piece of youtube channel art for a friend. I’m using the suggested pixel size and ect. But when I got to upload it, it cropped it up horrible. Is there any way to fix this?
Because the only way to fix it seems to cram it all into a tiny area. It took three hours to render at 10,000 samples (complex lighting issues) with resolution set to 2560x1440 (youtube suggested size). But like I said, it crops the entire photo down to nothing and I can’t fix it.
Any help is appreciated.
That’s the way it is. Only a tiny band in the center of the huge image is useful for a typical browser. The rest is for those who browse YouTube from their TV.
Full explanations that you must have missed: https://support.google.com/youtube/answer/2972003?topic=16630&ctx=topic&hl=en
Is there any way I could add some sort of template in blender I can overlay on my camera so I can tell where to place everything?
I’d rather not blindly guess where to place stuff.
Yes, you can! 
I couldn’t think of an easy way to do it… until I remembered that you can have a background image visible only thru the camera.
So, just create a big fully transparent image of 2560x1440 with only a (rather thick) frame of 1546x423 in the center. That’s all you need.
The frame must be rather thick because most of the time, you see only a thumbnail thru the camera and thin lines become hard to see. That’s also why you’ll want a bright color or, at least, something that will contrast with the scene.
Activate the Background Images in the Properties Shelf (a.k.a. [N]-Panel on the right). Click the button to load your image. Select “Camera” as Axis and click the “Front” button. (That really should be automatic. Any way…) Et voilà! 
Perfect. Thank you for all the help. I found a (mostly) transparent image and I’ll hopefully be able to modify my logo to fit inside of it. Thanks once again.