Hmmm... kind of a tall order, but here goes. Bear in mind I'm a WWII U.S. fan!

Any of the older kits from Tamiya. The M3 Lee comes to mind. (personal favorite) It's very easy to build straight out of the box. Even the M3 Stuart is an easy starter. Neither kit is very accurate historically, but for a starters, they're great.
The best way to paint is of course with an airbrush. If you do not own one, brushing is still applicable.
I use only acrylics. Model Masters and Lifecolors. They are easy to work with, easy to clean up after, and have a huge variety of colors to choose from.