lot of good suggestions, but if I may suggest to simplify, and keep your cost down.
1st. Catholic translation of the bible. New American Bible is the version used for the readings at Mass, and you will probably be given one when you start RCIA and you will find low cost paperback versions in bookstores and at the american bible society website. Other good translations are the Revised Standard Version, Catholic Edition, which you may prefer if you grew up with the KJV or authorized version. Jerusalem bible is also good, but the latter two are rather expensive.
begin with Mark’s gospel and read it through, as if for the first time.
2nd, Catholicism for Dummies, cited above, will give good short definitive answers to the questions you have at this time.
3rd. CAtholic Home study, cited above. This will include not only a Catechism, but a study guide for it. At this point, the catechism is a bit too dense and full of info for you to tackle on your own. You will probably be given both of these when you start RCIA, but I believe these are distributed free by the Knights of Columbus. If your RCIA class does not give you a Catechism, get one yourself, they are less than $10 now that the New Adult Catechsim is out. It is steep, $25 in paper, but again, wait and see what they give you in RCIA.
Don’t overwhelm yourself, see what is on the internet before shelling out big bucks on books. you know about the best website CA – check out the homepage on specific topics of interest. Now check out the rest.
daily Mass readings
articles from columnists on various points of Catholic belief, and how it applies to living in our world
for great reliable Catholic links, including a very easy-to-search Catechism and Catholic Encyclopedia