Chester,
I am not sure what an Iwata hose looks like on the end but I would assume that it is a 1/4 NPT on the end as most are. Maybe somewhere here with an Iwata hose could help you better there. I have an Iwata but it has a quick connect on it and fits on my Badger hose.
As far as cleaning supplies that depends on what you will be spraying.
If you are going to use enamels then I would get some cheap lacquer thinner at a hardware store or Walmart and use that for cleaning. If you want to spray acrylics then you can mix 2 parts filtered water, 1 part Simple Green, and 1 part Windex and put that in a squirt bottle to use as your airbrush cleaner.
Some people use Q-tips and pipe cleaners for cleaning their airbrushes but you have to be careful with them as the pipe cleaners especially can leave lint inside the airbrush when cleaning and that can lead to spraying problems just when you are trying to paint something.
I prefer the Airbrusher's Brushes that they sell at Dixie Art, Coast Airbrush and BearAir. They are nylon brushes that are impervious to lacquer thinner and the set comes with several sizes to clean the entire airbrush practically.
I would definitely buy some airbrush lube also as it smooths the action of the airbrush and helps eliminate paint drying in the airbrush.
Both Badger Needle Juice and Medea Super Lube are good so use either one.
I hope this helps
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon