No one here is going to give you legal advice - might point you in the right direction though.
Most attorney's (here at least) will give you an initial consultation without charge. Never heard of an attorney doing a divorce/custody case pro bono and since it is a civil case not a criminal one, the state will not provide you with an attorney.
The unfortunate part of all of this is that you are in California where to many people "guns" is indeed a 4 letter word.
Wish you the best - it ain't fun.