To add to what others have said, as someone who went through RCIA last year and was baptized/confirmed at Easter 2015, if you aren’t already reading about the Faith, consider starting. There are so many good books out there for people considering conversion- I especially liked “Rome Sweet Home” and “The Protestant’s Dilemma”. If you’re not a big reader, consider listening to the talks on CD by Lighthouse Catholic Media or look for talks on Youtube by Scott Hahn, Mathew Kelly, David Currie, and other Catholic apologists. The RCIA process is a 9 month process but even still there will be some things they just can’t cover due to lack of time. My class was 1-1/2 hours every Sunday for 9 months and yet when we got done there were still a lot of things I didn’t understand, primarily on daily living as a Catholic. One of the most helpful books for me in that respect, honestly, has been “The How-To Book of Catholic Devotions”. You’ll get a lot more out of RCIA, I think, if you really delve into things on your own.