Dear Aaron,  

You are taking the proper first step by doing RCIA, which will introduce you into the Catholic Faith. As you do it, make sure not to limit yourself to what you get in the classes but to undertake your own reading and study of the Catechism, and do some delving into websites such as Catholic Answers. Especially, go regularly to speak with Christ in the Eucharist to continue to grow in your knowledge and relationship with him; he will lead you. Place your journey in Mary's hands.  

Keep in mind that you will not be able to go directly into formation for the priesthood right after your Profession of Faith and acceptance into the Catholic Church, since it is always prudent to live one or two years as a Catholic before taking such a step. However, that doesn't mean you need to put your vocation on the back burner: you can pray to Christ every day for the grace of being called; you can make your choices as regards your reading, prayer, study, social life, participation in parish activities in reference to your possible vocation, picking what will help it and avoiding what could hinder or endanger it. That would be truly prudent.  

Your priest friend who knows you more than I will surely be able to give you more concrete advice.  

God bless.