Purchase flashcard paper. Paper shouldn't be too difficult to find and shouldn't be too expensive either. Depending on how durable you want your flashcards to be, you can find and buy printer paper, postcard paper or photo paper at from the local office supply store.
Open a general word processing program. For example, in Microsoft Word 2007, open a blank document and go to "Page Layout." Click on "Size" then "Page Setup." Once you are there, go to "Paper" and it's on "Custom size." Type in the desired size that you want your flashcards to be and then press "OK." The standard flashcard size is five inches in width and three inches in height.
Fill in the information you desire to study for. For example, in Microsoft Word 2007, you can choose to change the font and enlarge the size of your font go viewing those options back at "Home." If you press enter or do a page break, you will open the second page or the index card with the same dimensions. You can choose to create as many index cards as you want.
Save your custom index cards. You can save them by clicking on the Microsoft Windows symbol circle located on the top left or press "Ctrl" plus "S." It's a good idea to save it as a Word 97-2003 file so that it is compatible with older systems. For example, you might be running late for class and happen to save your index cards document on a newer word processing software such as Microsoft Word 2007 at home. When you go to school library and try to open it on their word processing software, they might only have an older version of the software such as Microsoft Word 2003. If you were to have only saved it as a Microsoft Word 2007 file, then you would not be able to open it. But if you saved it as a Word 97-2003 file, this file would be compatible with Microsoft Word 2003 and you would be able to open it, saving you a trip of going back home to print out the index cards.
Print your flashcards. You can print your flashcards by clicking on the Microsoft Windows symbol circle located on the top left or press "Ctrl" plus "P." Cut the flashcards out from the paper. Repeat this process until you build a stack of flashcards.