I will be printing my artwork on canvas and also photography on canon luster or matte paper. If I buy 8.5x11, 13x19, 8x10 paper should i print those borderless or bordered? If bordered what size would I set the borders to fit on frames? What are the popular sizes? If I wanted to print 8.10 on 8.5x11 paper how would I go about doing that?
I will be printing photoshop and/or print studio pro on an imac 10.11
There have been lots of posts about printing problems with Mac's. Apple Releases OS X 10.11.4 El Capitan is the latest, I believe. If you have it make sure you get the latest Canon software and drivers.
I use Win 10 and don't any of the issues as my Pro-100 works perfectly. So I will not be able to help you with your Mac beyond this.
Canon imposes a 30mm border on heavy paper (which would be canvas and any fine art paper).
I generally print on 13x19 paper and use a 10x15 aspect ratio. This gives 1.5"margin top and bottom and two inch left and right.
You can use Print Studio Pro to set up margins, print size, etc.
It sounds like perhaps you aren't starting with an image in a 2x3 aspect ratio. If you have an 8x10 image and change the short side to 10 inches the long side will become 12.5 inches.
You can print an 8x10 image on A3+ paper but it will be 12x15 max size. Its all working correctly; you just need to crop your image to a 2x3 aspect ratio.