@Vinzenzo -- Great points and I would go one further by suggesting that anyone setting up a business should consult with an accountant when cash starts rolling in. More than one business has been ruined by poor tax planning.
I would let that accountant take care of estimated taxes, too. The last thing you want to do is not be able to meet your tax burden. Once that happens, you will have the IRS crawling all over your affairs for years. Yuck.