You don't actually have to provide anything other than to return the notice of defense with a request for a hearing. However, a lawyer would likely respond to each accusation and provide any available defenses to the accusations in order to put the matter fairly before the administrative law judge.
The administrative hearing process is much faster and less costly than a regular lawsuit -- however, that works both ways, because you can lose a lot faster, and not be able to force a settlement as easily as you might in Superior Court, where the litigation costs sometimes make continuing legal action for your opponent impossible to bear.
You can make an electon, right now, to transfer to the Superior Court by serving notice on the DFEH within 30 days of service of the Accusation/Complaint of your eletion to transfer. This means a full-blown lawsuit between you and the DFEH, unless it decides to voluntarily dismiss the action and let the complaining party refile the action against you in court.
Frankly, this is nothing to mess around with. If you try to defend yourself, you may lose and never know why.
For an employment rights attorney referral, see this link.
Hope this helps.
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