At any office supply stores, you can buy pages of blank checks that you can print onto with your computer. Software like Quicken and Quickbooks will print them for you. If you have a company's routing/account number, you can print those onto the check. Like maybe the routing numbers from your own paycheck.
I'm sure you can do it, but not getting caught is probably the hard part. You would probably need a fake ID to go with your checks.