When launching a new product, I find that my team and I get nervous when trying to decide what sort of price tag to put on it. Just for the sake of example, we have no access to any sort of funding; we develop Wordpress Plugins and miscellaneous scripts in the internet marketing niche.
Some things we've tried to take into consideration are the following:
Is there a formal model that has been developed already?
Pricing is always a challenge - and there is a ton of advice on the web to review.
Many focus on what value the prospective customer receives, and what pricing anchor they would compare it to. Its up to you to understand what is valuable and whether the appropriate anchor is referenced (example: if someone believes that websites are something that the teenager next door can whip together in 10 minutes, you're unlikely to sell them a solution @ $5000)