Several months ago No Pepper tipped me off about this web site which had a schedule maker. I have used it a few times to easily create a few schedules for my Great Lakes Baseball Association.
Fantasy Football - Schedules from Footballguys.com
Before creating the schedule, you can either enter the name of each team or not enter any team names. After the program creates the schedule, you will either be forced to create your schedule by entering each game manually into the OOTP game or create your own schedule using notepad. If you plan on having Spring Training games, you will have to enter those in manually (at least I was forced to).
Good Luck!