How exciting! Welcome to the wonderful world of Eloqua.
In my opinion, the answer is twofold. Take advantage of the wonderful Topliners community and start taking classes with Eloqua University.
Here is a good article on Getting Started with Topliners.
As for Eloqua University, it's pretty easy. You will need to have an All access Education Pass (AAEP). An AAEP provides you, the pass holder, a full year of unlimited access to Eloqua University. There is an extensive library of instructor led sessions and on-demand, self paced training. There is a variety of courses, appropriate for new or experienced users. Once you have an AAEP, we recommend everyone begins with the popular Eloqua 10: Fundamentals Series. Registration is easy, and the series starts with a 1-hour self-paced course that you can take anytime. Most of our new students try to complete the Fundamental series in their first few weeks. After that, we have a recommended learning path, but every course you take, or even how many times you take a course, is completely up to you. You can see a full list of courses here. Here is also a helpful link with answers to common questions.
I hope this helps. Good luck!