Photog Questions

I have a retina MacBook Pro and for years have heard how great Macs were for editing. I'm wanting to get into photography and was wondering if I could get some starter input. I'm wanting to buy a camera for around $500. I assume that most of my shots will be done outdoors of large vistas. I want the camera to be able to take an SDXC card since I have a 64 Gb laying around. I also would like to know which programs are good. I'm thinking that I'm going to buy Pixelmator because it is currently $15 but what is your opinions of Aperture vs. the Adobe equivalent? Any help is mucho appreciato.