I have zero experience with OpenGL and a small amount of experience with Objective-C, but I'm fairly decent with C++. What resources should I be looking at to start learning how to use OpenGL within Objective-C? 

I read somewhere at some point that starting out with NSOpenGLView is a good start.
['https://Stackoverflow.com/questions/5384157', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/657850/']
Given your affinity for C++, [this](http://iphone-3d-programming.labs.oreilly.com/) will probably be the most appealing resource for you. It covers OpenGL ES 1.1 and 2.0, so you'll get all you need to know.

Personally, I really enjoy [this set of tutorials](http://iphonedevelopment.blogspot.com/2009/05/opengl-es-from-ground-up-table-of.html), which avoid C++ and are quite well written. It only covers 1.1, but that may be an easier place to start anyway.
[NeHe's tutorials](http://nehe.gamedev.net/) include full Cocoa versions of all the early tutorials.