I agree with the answer of @Chris Johns, especially about getting your parents on your side and the need to handle schoolwork and the dedication you will need to attract a sponsor. And, as @David said in his comment, you will have to clean cages to prove yourself. Now for some details of what is required in California.
The California Hawking Club lists eight steps to become a falconer. The steps are in chronological order. What follows is summarized or quoted from this article.
First, you must pass a falconry exam. The article directs you to the materials you will need to study. This exam appears to be akin to the exam one has to pass to get a driver's learner's permit -- bookwork, no hands-on experience required.
Second, get a hunting license, for which you must have taken a "gun hunter safety course".
Third, get a sponsor. I quote this section in its entirety:
An applicant to be an apprentice must be sponsored by a third-year
general or master falconer. Once you're a CHC member and have passed
the falconry exam, the California Hawking Club Apprentice Chairs will
assist you in contacting potential sponsors (the State does not help
you in this regard). This is just one of several excellent reasons to
join the California Hawking Club. Unless you are fortunate enough to
know a master or general falconer willing to sponsor you, you will end
up talking to one of the California Hawking Club's Apprentice Chairmen
for the name of candidate sponsors. Those candidate sponsors come from
the ranks of the California Hawking Club. They are not obligated to be
a sponsor. You must establish that relationship, and being a
California Hawking Club member is an important step of that process.
Sponsors are looking for apprentices that have done their homework,
passed their test, have their hunting license, follow directions, love
hawks and are willing to hunt with them.
In the remaining steps, you will be guided by your sponsor, although you will have to do a lot of work yourself. One of the steps is acquiring equipment, which will probably mean earning and saving money and convincing people who give you gifts to give you what they think are rather odd things, such as Alymeri jesses (?!).
This article appears to be an excellent resource, but I don't have the knowledge to make an informed judgment as to whether it tells you everything you need to know to get started. The major omission I see in this article is that it does not tell you how to learn how to train your hawk. I assume -- but assumptions are dangerous -- that your sponsor helps you in this, and that the California Hawking Club may also.
I just noticed the comment of @Rastafarian referencing this article.
Addendum: See also North American Falconers Association
Falconry is not an "overnight" achievement. Becoming a Master falconer
takes at least seven years; finishing your apprenticeship alone will
take at least two. Your hawk requires a significant amount of time,
every day, 365 days a year, and a bird in training requires
substantially more time.
I hope that someone who knows falconry first hand will provide an answer. Meanwhile, gear yourself up to do a thorough internet search, a lot of reading, and find some cages to clean. Learning the elements of carpentry is also a good idea.