Crafting table turtle and printer HELP!

I have no idea how to operate a printer I know that it has to have a computer but I don't know what to do. Also I need help with these crafting table turtles I bet that they're useful and so I am asking Pros to help. Please :D/>

The printer's commands are accessed by treating the block as a peripheral.

Crafty turtles are a bit simpler: You just stick the materials into their inventory, then call turtle.craft() (edit: well, getting the items into their inventory in the correct positions might not be simple; the actual crafting bit is ;)/> ). Note that it only works if the turtle's inventory contains the correct items (layed out in the correct shape - assuming the recipe isn't shapeless), and nothing else.