First: Get out of California.

Move to Texas or Tennessee or Florida, where taxes are far lower.

This single step will solve many problems.

Next: Work with an attorney to answer your questions.

Also a tax professional.

Cheapest tax professional you can hire is H&R Block Executive Tax Services.

This is a special... fairly unknown part of H&R Block which deals exclusively with complex + multi-jurisdictional entities.

You'll find no better expertise/intelligence any cheaper than H&R Block Executive Tax Services.