I use a Badger 200 Airbrush which has suction feed, internal mix and single action. I find it suitable for most needs. I most recently used it to spray a 1:96 scale Type 42 destroyer hull, that's 54 inches long, with no problem. You can fit a paint jar for bigger jobs or a cup for smaller detailing work. The spray can be set to pencil line or up to well over an inch. Distance from the job will also affect this. For really big hulls I resort to aerosols,
As for a compressor, take your pick, but I would recommend one that is quiet, has a pressure gauge, moisture trap and at least a litre reservoir (this prevents pulsing of the airflow). I also have a 6ft airway as this allows me to move around a large hull easily.
You will need to check with your supplier that the brush and compressor airway connectors are compatible or if an adapter is needed.
I also recommend that you start out spraying something that you don't mind messing up, as they say there are three things you need to start airbrushing practice, practice, practice. However, if you don't try you will never succeed.
All the best and good luck.