...Of course this is the most asked question . Rather than just hoping you can get an agent, Think outside the box to get those first jobs;
Check with friends who have businesses that might need a new on hold message. Do a search for new authors and contact them to see if they would like an audio book version of their work. Search for start up animation companies that need cartoon voices to get their projects started. In these cases you can offer a solution to their casting problems and get maybe get yourself some work.