If the facts are as you represent, you can relax a bit; some legal changes in the 1980s mean that the parents' filling out an affidavit of paternity (that is HOW your name got on the birth certificate if you two were not married) has the same legal effect as a court order of paternity. See the explanation and materials posted at http://willicklawgroup.com/paternity/.
And if, as you indicate (but did not explicitly say) the child has lived in Nevada since birth, this is the only State with jurisdiction to make a child custody determination for the next 6 months, even if mom leaves with the child during that time. In the eyes of the law, you two have exactly equal legal rights just now. See "The Basics of Family Law Jurisdiction" posted at http://willicklawgroup.com/child-custody-and-visitation/.
Procedures have changed in recent years; as paternity has already been established, you can file an action for child custody, visitation, and support, either "in proper person" (forms at the Clark County Family Law Self-Help Center) or through counsel. You really should consider at least a consultation with a qualified family law specialist before proceeding.
Answered on Jan 20th, 2015 at 2:01 PM