Recommending an airbrush is like recommending a paint brush. There are different types for different usage, so unfortunately there’s no one answer. Brand wise, If you can afford it, go for Iwata. If you’re starting out, then one of their starter kits are the best way to go. Second recommendation is Badger. Mind it, I haven’t used either since they are way too expensive to import here in India, but these brands are time tested and as soon as I get a chance to travel abroad, I’ll be getting myself a few. Both of their websites have guides for starters and you can leverage that. Hope this helps.