I assume you mean non-Disney trip instead of non Orlando trip, and you will be going to the Universal Orlando parks? Generally, Universal requires a lot less planning, depending on the crowds. I am not familiar with the end of March, but I suspect it will be pretty crowded due to school Spring Breaks, so it is good to do some planning.
You can start your planning with the Universal forums right here on the DIS. There are lots of "newbie" threads and trip reports to review. You should also look through the Universal website, particularly the park times and maps to familiarize yourself with the locations of attractions, restaurants, etc. Finally, you might want to order this book or look for it in your library...