My favorite will probably always be Tamiya acrylics. They shoot nicely and I can clean the airbrush out with Windex. The problem with Tamiya paints is the lack of specific colors. I actually like being able to buy a paint per its FS number, rather than mixing colors and hoping I get the right color. This is especially true if I don't mix enough for the first round of painting.
My issue with MM Acryl paint has always been cleaning it out of my airbrush, until I found that denatured alcohol actually cuts it and cleans out the airbrush.
For primer, I have been using Mr Surfacer 500 or 1000 shot through my airbrush, and so far, haven't had a problem with MM Acryls adhering to it.
I agree with everyone else about thinning. I try to only use the manufacturer's thinner. Less chance of a gloppy (technical term) mess in my airbrush.
Welcome to the forums, and good luck!