Hopefully, if your new agent training is any good, you'll have more of a clue by Friday. But one of the first things you can do is start a list of your Sphere of Influence (it'll grow, as you remember people that you forgot first time writing them down) with contact info for your announcement letter or however you're going to let people know you're in the business. You could also get started on your website by playing around on the net and seeing what you like and don't like about a bunch of different sites (assuming you don't already know this), and do some research into who you want to use for your own site as far as designing/hosting. Figure out what database you want to use to manage all these contacts you're going to have. See if you can arraneg to shadow another agent in your office for a day. Take a couple of successful, friendly agents in your office to lunch and ask their advice.
And then just jump in. In our office, the other agents are more than happy to be helpful to newbies.