So, here's how I do my paper piecing, step by step with photos.
You'll need some freezer paper. You can do this one of two ways, the quick and easy way is to purchase pre-cut sheets like these:
Or if you a roll of freezer paper on hand, or would prefer to buy a roll of it and make your own sheets, you can do that too. You can usually find freezer paper in the grocery store, by the aluminum foil and plastic wrap.
If you use the roll, the next steps will show you how to print on your freezer paper sheets.
Cut youself enough 8 1/2 x 11" sheets for your block. My block took 8, but I cut more than what I needed and stashed them away for later. Now grab some of your printer paper and head over to your ironing board.
Layer a sheet of freezer paper on top of your printer paper, shiny side down.
With a iron (no steam) on medium to med high heat, press the freezer paper onto your printer paper. You don't want to iron it too much or you'll have problems peeling it off later. Mainly make sure the edges are pressed down where the paper will feed into your printer.
Next, print your designs onto your freezer paper, and then peel your freezer paper off, and save the printer paper for later use! Pretty slick huh?