Hi kiki! Welcome to the forums.
I'm not doing Japanese, but I am doing Korean at Monash (not sure if I'm majoring just yet); hope I can answer some questions though! Keep in mind this is from only my experience/knowledge gained from one introductory unit.
1. Not sure as it would be very specific to how they constructed the Japanese language units. But... I'm studying Education alongside Arts, and they seem to say a major in a language (not your native lang) is enough to be able to be registered as a LOTE teacher under the Victorian Institute of Teaching. So probably fluent (if not, very close to fluent), but not
fluent fluent or native fluent. That's very vague, sorry!
2. Korean introductory classes are about 20 people, with very cramped lectures. Japanese runs on a different class system, but I can try and get in contact with some friends who do Japanese to get some insight!
3. I know there are exchange programs you can go on, but not sure if there are exchange Japanese students at Monash. I am also not 100% certain about official practice mediums, but there are definitely ways of practising languages through other methods. Monash is pretty diverse, so finding a Japanese native or speaker to talk to shouldn't be too hard. Once you are into Monash and are able to contact the Japanese studies staff, they could definitely try and help you.
4. Because you will have completed Japanese in VCE, you would be excluded from doing introductory Japanese (i.e. you'd start your Japanese language units from intermediate or proficient depending on your competency). There is an online test you can take made by Monash to see what stream you should get placed into, so try that after your studies are over! Taking a look at the handbook, a major
does include culture units, not just language (this seems to be the case for most languages anyway). Culture units is an encompassing term for units that delve into Asian history or society more generally, but also some more 'general' culture stuff like etiquette. Both are sometimes specific and non-specific to the language you are studying. Things like etiquette are often thrown in where possible in the language units anyway. The lecturers and tutors have tried to throw in some cultural/etiquette tips for Korean intro at least.
Can't answer your drama questions with confidence. Though, I feel theory is definitely part of it.
EDIT:
Found your question in the Ask Monash Uni thread and thought I'd tack it onto this:
Hi Monash,
I want to do a double degree in teaching and arts but I want to take electives from fine arts. Is that possible? I'm really interested doing CDS2531 (Illustration for animation).
Thank you for your time!
Unfortunately, Education/Arts is very strict on what they allow you to do from what faculty. This is because you have to meet the requirements of the Education degree, the Arts degree, AND additional requirements to be able to sit the 4th year of your Education degree (i.e. taking the appropriate major/minor so you are qualified for 2 areas of teaching). Although there are electives as part of the Arts requirement, these are FORCED Arts faculty only (at least I've been told that and the course map says that).