Jeannie, there are two national sources of auctions that are well known. They are:
Auction.com and Hubzu.com. As a new agent, you should avoid Auction.com
Be aware their are many other auctions available on a local or regional basis. Unfortunately, you will need to be on HIGH ALERT because the terms and conditions of every auction, and the situation of the real estate is different.. You have to start somewhere, and just like most of us here, you can figure it out but you must invest the time and REAL Everything.
Go to local and government auctions, and register. You will receive the terms and conditions as a result. READ THEM.
Now, as a new agent, use the published auction schedule in for advertising. This is a good place to start as you create your bread and butter market strategies.
WARNING! WARNING! WARNING!
Make certain you understand how you will be paid in each auctioned property. Sometimes, you will find the buyer must pay you directly. If you don't cover this issues at the start, you WILL end up working for FREE. That is not a good start. READ EVERYTHING.