NYU Math and Finance

I will be a Freshman at NYU Stern next year and am interested in double majoring in applied math and finance. If this a good idea (job-wise)?
How would I go about doing so? I know about the Courant school and am wondering how I can join the program as I’m not sure if it’s an option for undergrads.
Any info, advice, comments, etc are much appreciated.
Thanks!

I don’t know what mean good idea job-wise. If you are interested in math you should major in it.

Math is generally a very tough major so and if you are interested and think you can do well, then go ahead and do it.