yes, you can apply to a (3 year) m.arch 1 program if you dont have a ba in arch. thats the general way.. y not start exploring at ucla itself? im not sure if they have a summer introduction to architecture course for interested people, but i know sci-arc has something called Making+Meaning workshop where you can get a first hand experience,,, if its accessible, id start askin around at ucla, and, even if you want a change, the same requirements would probably apply everywhere..

i dont know where you can "start" in terms of building a repertoire, but, there is a number of "what books should i read" threads on this forum,,search for them,, take a look there, just pick up a book and see where it will take you

yes, you can apply to architecture schools without a background in architecture. However, most graduate programs have some basic pre-requisite requirements: typically these include physics, calculus, and one or two architecture history/design courses.

I'd check out programs in your area and schedule a time to meet with someone. UCLA has an architecture program - I'd start with them.

If you are in LA, I would highly recommend checking out Los Angeles Institute of Architecture and Design LAIAD. laiad.com It's an intensive Grad Prep course to help you and give you an edge to get into an M.Arch program. It was started by the guys that started SCI-ARC. I am taking the summer semester right now. I think it would have two functions for you. You can decide if it is really something you want to persue, and if so help you build a really decent portfolio.

You can call them at 213.251.4500 to make an appointment for a visit.

If you just graduated from UCLA and are still in the area, I would second tasslehawf's comment and recommend LAIAD too. a year there in their grad prep program basically got me into grad school and I had no background in design

If you have paintings, sketches, drawings, models, sculptures, photography, or anything like that I would start gathering up all of that stuff so that you can put the best images in your portfolio when it comes time to apply.

One of the best pieces of advice I was ever given was to start becoming aware of the built environment. Begin to identify certain elements of architecture, style, context, and the overall sense of appeal certain built spaces have to people. Take plenty photographs and sketch, sketch, sketch! You will be sketching a lot in school, so the more you do it, the more your skills will improve.

I would read up on some of the modern architectural movements and current successful architects. This way you may begin to establish your own positions and ideas, and identify with the work of some of these architects.

Good luck!