Seems like the "go to" solution (in other words, the one everyone runs to) is CorePlot, which you can find on GitHub at:
And there's a RayWenderlich tutorial on stock charts with CorePlot, however his (or their) tutorials are more geared for iOS so you may have to do a bit of adjusting to make things work with MacOS. At least you'll be in the same neighborhood (using Objective-C, CorePlot, etc.).
I suspect any solution is going to be a bit "heavy" (or too much) for you to consider as a new programmer. Graphics & plotting within an app can be really intimidating, and you should try to get a couple other projects under your belt and in your portfolio first.