You are really not going to be able to save more pre-tax money merely by using an LLC or an S corporation. Just fyi... (The type of entity you have doesn't affect the deductions you claim in almost all cases.)
Note that you can sometimes use an S corporation to dial down the self-employment or payroll taxes you pay... (That's sort of premature to talk about before you've even started your business though... it's a conversation to have with a tax accountant once you know what your first year or years will look like.)
BTW, in case you don't know this, California makes it really expensive for small businesses to operate as an LLC. The minimum LLC franchise tax if you're an LLC or S corporation is $800 a year. But it can make sense in some scenarios to start as an LLC... initially the LLC gets treated either as s sole proprietorship or partnership for tax purposes... and then later on, if things ramp up, you can make a Subchapter S election and have the entity treated as an S corporation (even though legally the entity will still be an S corporation) if the S corporation tax accounting will save you money.
P.S. In my opinion, paying for the advice of three attorneys to get multiple points of view would be a waste of money and time.