This depends a lot on what you do. Pre-money evaluations vary widely. Some things to consider are:
So, without knowing your specific idea, market or your team dynamics, evaluating your pre-money evaluation will be tricky but the questions about will be how you would eventually get to an evaluation.
Salman Khan has some tutorial on his page regarding Venture Capital and Capital Markets. I found this very helpful. He does a great job of explaining a number of concepts related to capital markets. Some of the tutorials are a bit high level for what you are looking for. Have a look (http://www.khanacademy.org/ ).