Congrats on your first tool! I think it's good choice for a start and this brush will serve you well in future when you'll "grow up".
I'd highly recommend to add to your current set this thing
https://www.paascheairbrush.com/product/vl-14-oz/ This one or similar, there are some with the lids.
It will make your brush more comfortable to work with fine details, where you need to grip the AB with both hands and to get closer to the surface. You can't have this convenience when using the bottle. This cup also gives you a possibility to use small amount of paint, much smaller than you'd need with your bottles. And besides, it's easier to clean than a bottle.