hi,
there are 2 canadian medicals in california. check them in the link;
Civil Aviation Medical Examiners (CAME) - Details
Civil Aviation Medical Examiners (CAME) - Details
you take call any suitable one and fix an appointment over the phone.
it takes a month to process the file no. so get the medicals done as soon as u can.
you can approach the the consulate general in los angeles for the visa. here is the link:
Consulate General of Canada in Los Angeles
you would also need to arrange for a centre to give your rt and cpl examination.
having selected a centre get in touch with them directly through the correspondence mentioned. the officials there are extremely friendly and helpful so u won't have much trouble there. get all this done before hand.
mind you the cpl conversion paper is a little tricky. so goodluck!!