How are you printing? From Lightroom? From Photoshop?
First, you need to calibrate your monitor. Full stop. If you don't have the colors set right and the brightness set right, you are not going to match what you see on screen. This is one reason why novice printers so often say that their prints are too dark. It's because they are editing on a monitor that is too bright.
Second, I don't know whether this is part of your problem, but a common cause of distorted colors is having both the software and the print driver trying to control color. It has to be one or the other. If you are printing from LR or PS, have them set to control color (in lightroom, you use the drop down menu to substitute the profile for you paper for the default "printer control"). Then you have to tell the printer software not to control color. This may be different on a Mac, but on a PC, this is done by going to the printer properties and setting color matching to "none." Maybe someone who uses a Mac can say whether it's different on a Mac. When I first started printing, I had a lot of color casts, and that was the problem.
Re "proper paper"--there is no proper paper. Any paper for which you can get an ICC profile for that printer is fine. I used a pro-100 for several years and used papers from Moab, Canson, Red River, and Canon. All worked just fine.
I don't understand your reference to a plug-in. There are various plug-ins you can use, but none are necessary. I have never used any of them with any of my Canon printers. I print almost entirely from Lightoom (even when I have edited in Photoshop), and it works just fine without any plugins.
The Pro-100 is a superb printer. It doesn't produce archival prints because it uses dye-based inks, but if you put carefully done prints from that printer and my expensive Prograf next to each other, it's very hard to see the difference. So it's worth your time to get this right.
Good luck. Hope this helps.