I only started with their comics a few months back, and this worked well for me:
For Ms Marvel, just start at her first comic and work your way forward. She's relatively new, you can blast through most of her solo run within a week.
Following on from that, I went into Champions, the teenage superhero team that Ms Marvel heads up. It started only a few years ago, so it's quicker to catch up on than Ms Marvel's solo run. From that, you'll get introduced to Miles and Nova (and a few others). As an extra, you could read through the few issues of All New, All Different Avengers that Ms Marvel is a part of (Nova and Miles are in that too), and it has the advantage of including some heroes who are relevant later on in Champions as well (eg. new Wasp).
From there, I went back to look for some Miles content. He's been around a bit longer than Kamala, and a lot of his stuff occurs in an alternate Universe. So for his stuff, I started following the plot where he was finally injected into Earth-616/the main Marvel continuity, which is also when he meets Kamala, etc.
I haven't gone back to Nova's solo stuff yet, I've had a few other comics I've wanted to catch up on first.