wut how do i print out bitcoins on paper? and how do i get them back in the computer when i want to spend them?
You're not printing out bitcoins, you're printing out the keys to your bitcoins.
Think of the bitcoin system as a large vault filled with safety deposit boxes. Each safety deposit box has an address; that's your bitcoin address (also known as public key). Each safety deposit box also has an entry code: that's your private key.
When you create a paper wallet all you're doing is taking your public and private keys and writing them down. The bitcoins stay where they've always been.