The 83(b) election would have been made on your personal tax return in the year the shares were granted. It is too late to make that election now. You should have declared income equal to the value of the shares when they were vested. This was likely reported on your W-2 that year as wage income, so you probably already paid the tax on it.
The difference between the amount you receive from the proceeds less the value of the shares when they vested (the amount reported on your W-2 form) would be capital gain income on this year's tax return.
You report the proceeds in the Investment Income section of TurboTax, under Stocks, Mutual Funds, Bonds, Other.
Since you received the proceeds when you resided in California, they would be taxable in that state. However, you will probably get a credit for those taxes in the state you now reside in, if they are also taxable in that state.
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