Can i get a MMj card in californina?

If you are under 18, you will need parental consent. If that's not a problem, you will need to find a doctor that is willing to prescribe it to you for insomnia. It will be easiest with a doctor that specializes in medical marijuana recommendation. I don't know where in California you are, but just google, for example "medical marijuana card San Diego" and you should be able to find a legitimate doctor who can see you for a consultation.