After I scanned the photo, I then cropped it or enlarged it, which ever the photo needed.  You will have to find out if your printer, prints on the top or the bottom of your transfer sheets. This way you will know what way to  load the sheet  into your printer.  I usually test print the photo on a regular sheet of computer paper to make sure it looks OK.  After all, regular computer paper is a lot cheaper than photo transfer sheets.  You also want to make sure that any photo that has writing in it is copied,so that the writing reads correctly when it is transferred  to your white material and not backwards.  If it does come out backwards on your test print, just flip the image, or what ever button on your printer does this function.

There are several types of transfer sheets available.   One kind is where you iron your transfer onto a piece of white material.  The other type makes like a sticker, that you stick on your white block, then set it with an iron.  Either one will work, and they are both machine washable.  You might want to pick up a pack of each so you can try for yourself, then decide.

For some reason, sometimes the photo will print darker than the photograph.  I don’t know the reason for this.  Maybe it is that the transfer paper has a different texture than regular computer paper so it absorbes the ink differently.  I just don’t know.