Actually, I might try launching a business during the full moon, when it is at its most potent. Or a waxing moon, as you gain lots of "acquisition" energy.
The sun is currently in Virgo, and will be there until the end of this month -- which makes it a great time to handle anything involving communication and technology. The next sign is Libra, which as an air sign, rules more over the intellect and therefore would be a decent second choice. :)