If you have filed an Order to Show Cause, and you are requesting support, you need to appear in Court. If you do not appear, your Order to Show Cause will be denied.
Child support is based on your income, his income, and the amount of time spent with the child. There are a number of other factors that the Court considers.
Look up Child support Calculators online, and toy with the programs to get a ballpark idea of how much money is due/owed.
Please note that this answer does not constitute legal advice, and should not be relied on, as each situation is fact specific, and it is not possible to evaluate a legal problem without a comprehensive consultation and review of all the facts and court pleadings filed in the case. This answer does not create an attorney-client relationship
It is highly recommended that you have an attorney represent you in any family law matter, especially if your spouse is represented and especially when minor children are involved.
The Superior Court's web-site has a child support calculator here: http://www.childsup.ca.gov/Resources/CalculateChildSupport/tabid/114/Default.aspx It will give you an idea of what the numbers will look like and of what factors are used in the calculation.
It is always a good idea to have an attorney represent you in court. If he has an attorney, you may be able to ask that he pay some of your attorney's fees. Therefore, there is no reason why you shouldn't consult with a family law attorney.
With regard to your question about how child support is calculated, I've included a link to an article I wrote which answers this exact question. Hope it helps. Good luck.
If you found this answer helpful, let me know by clicking the "Mark as Good Answer" button at the bottom of this answer. By answering this question, the Law Offices of Cathleen E. Norton does not intend to form an attorney-client relationship with the asking party. The answers posted on this website should not be construed as legal advice. The Law Offices of Cathleen E. Norton does not make any representations about your family law matter, but rather, seeks to provide general information to the public about family-law related matters. You should consult with an attorney to discuss the specific facts of your case. Thank you.