I would suggest checking out the Universal Studios website and reading through the list of attractions. It's a pretty good site just make sure that you aren't accidently on the Universal Studios Hollywood site. Yes, I did that once in the beginning...
Best attractions IMO are the Mummy's Revenge, Despicable Me, Spiderman, Forbidden Journey and the Jurassic Park River Adventure but it depends on what everyone personally likes and has the courage to enjoy. Try not to miss Spiderman and Despicable Me whatever you do. Your little one will likely love the Dr Seuss area and Curious George. There is a little train ride that goes above Seuss Landing. It might be easy to overlook but it's adorable particularly for a small child. It is a slow loader. There are also quite a few meet and greets in different areas.