good resources when you can afford them, but your first study bible for RCIA should be the New American Bible because it is the one used in the lectionary, and for this period the lectionary readings will be the basis of your study and your RCIA formation. If you want to invest in a good hard cover study bible that will last for years, the Catholic Study Bible NAB Oxford edition is a good infestment at under $40, from most Catholic book catalogs, including Our Sunday Visitor.
Your next purchase should be the RSV-CE, from Ignatius press as the language sounds more “biblical” and lest straight-forward conversational like the NAB, and will “sound” more familiar to you.
If you want to start building a library of studies on individual books, begin with the Ignatius press study editions by Scott Hahn. In fact any of his books on various aspect of Catholic doctrine are excellent because of his Evangelical background and ability to understand and explain some of the question you may have if your prior study has been in the similar tradition. This is now available I believe in a complete NT, as is the Navarre (the gold standard, but pricey).
There is a concordance to the NAB available, and the Dictionary of Biblical Theology, from
wordamongus.com is a good first reference book to have. the same source has a monthly devotional with the daily Mass readings, daily devotional commentary on the readings, order of the Mass, and other articles relevant to the season. I recommend this as your first devotional. they also sell very good topical bible studies for use alone or in a group.
More bible studies are available from Emaus Road, through the Catholics united for the Faith website,
cuf.org. For anyone who feels their RCIA doctrinal instruction is basic and wants to go further, the high school religion textbooks from Midwest Theological Forum (same site) especially intro to Catholocism and the Scripture course are excellent, in fact, the scripture text should be a basic in an Catholic bible study library. Ascension press is also a good source for reliable bible studies and resources.