In terms of setting up a website to comply with the various tax laws, is there different kinds of technology that we need to invest in? Any ideas or suggestions where I can get this infor would be greatly appreciated
I can't say that you need to have any hardware or software to be in compliance with the US tax codes. In the US, the IRS focuses more on the legal instruments (formal documents) that describe your business, how your earn your money, and how you will pay your taxes. As long as you can produce documentation that the IRS requires you should be fine.
We collect taxes from any order that has a shipping OR billing address in our state. This may be overkill, but we are erring on the safe side. If your state tax rate is 4.5% and your county/parish tax rate is 4.5%, you would charge 9% tax on the subtotal.