What entails conducting business in a state?

I am looking to form an Partner LLC in one of the tax haven states. I have been looking up the Pro's and Con's of doing this and it seems the major Con is that you still have to file and pay fee's in your home state if you are considered "Doing Business" in that state.

I will be Living in CA and will create (produce manufacture) a product from my home and then sell it on a website that I will be hosting (from home or out of state) and various other websites.

I will not have any property under the LLC's name and will not be hiring any employees or paying a payroll outside of the Partner and I and the general Pass through.

I feel that due to these reasons I will not be conducting Business in the state of CA and thus will not be required to file / pay fees etc in the state. Can anyone verify this?

Thanks

There's no such thing as "tax haven states". There are states that don't charge income tax, but that is only true to the income derived in those states and the states' residents.

I will be Living in CA and will create (produce manufacture) a product
from my home

The actual place of incorporation/LLC registration is of no importance, if its not CA - you have to register as a foreign entity with the SOS and pay all the same as domestic LLC (except that the fees are higher slightly, and you have to pay a foreign state for registration as well).