Please go check out this great new resource, New City Catechism. This has been put together by Tim Keller and it's an updated version of the Westminster & Heidelberg Catechism. There are 52 questions and answers, and with each Q&A there are Bible verses that the answer comes from, a short commentary giving fuller explanation, and a prayer related to embracing the truth of the doctrine being studied. The idea of this new resource is that folks would commit to memorizing and studying this over the next year (one a week). I commend this to you and would encourage you to go after memorizing and studying it for a year.
You can study it online and/or there's an app!