DIY microcomputer question

I am looking for an operating system for the Arduino Pro MIni(a program, not a bootloader), I want to use Sparkfun’s .96" oled (or mabye a bigger one), a custom touchscreen, and about 8 pushbuttons for a joystick/keyboard. I as hoping there is a simple Program that I could edit to work for this. I am also considering using a different microprocessor instead, such as a picaxe, Pic, etc. I don’t know any Programming yet, and I am willing to take a few hours to edit once I learn the necessary language. I also want wireless internet. Not for connectivity to websites (though it wouuld be nice), but I am designing it as a dev platform.

The Arduino doesn’t have an operating system!

As in a program that would allow me to do things a computer can!

Why not starting from the beginning: The good old Blinky, and “Hello world” examples :mrgreen:

Angelo