Going to Osaka & Tokyo early November, need some advise/answer

Hows the weather (in person) ? from google is autumn between 8c - 20c
Like Genting/Cameron? normal sweater/jacket will do?
Pocket money mainly for food/daily transport etc, RM200/6500 yen +-
Enough for 1 day? (first time visit Japan) not sure on the price
Regarding shinkansen, from Osaka/Kyoto to Tokyo.
I plan to go Nara Park in the morning, maybe afternoon will travel to Tokyo via Shinkansen.
Need advise the following?
1) From Google, I need to buy ticket at Shin-Osaka Station? price is around 15k+- yen (not sure if price increased). Using Tokaido Shinkansen line
I need to buy a few day in advance? or is there cheaper option like buying online before traveling?

2) Should I take the Shinkansen from Kyoto Station? Direct after visit Nara Park
If yes, can i buy the ticket at any Station? or how?

Japan got many "tourist pass" haaha very confusing to me 
Can i know how to determine which is tokyo Metro and Toei Subway lines? and where to buy this pass?

i see, how about Osaka? got any pass recommend?

hmm about price im not too sure as this is my first time go Japan but regarding food is quite expensive imo
for example for food like any normal restaurant or shop at mall normal ramen/don/rice is around 1000 yen/rm32, while in malaysia you still get it for around rm10-15 range
if is sets like with side dish, soup etc can easily go up to 1500-2000 yen.

but on the other hand for other stuff like gadget/IT product/toys/anime/model etc etc all the price are pretty similar with the one you can get in malaysia

where did you find Evian for 120yen? haha usually i saw is around 150 or higher
but ngl their bottle water are pretty cheap if you willing to carry around, as a 2L mineral water is only 65 yen
and their alcohol at konbini is cheaper than duty free at KLIA hahah 

oh ya the overall service and process is quite ok la no issues at all
but ya since you mentioned it the seat is very hard haha from SGN to KIX sit till butt pain 
ya i mean sure i can find like 500 yen ramen etc but in general prices for food are quite expensive in most restaurant at Japan if you dont purposely look for budget restaurant
haha even in family mart some chicken sandwich can go for 400-500 yen while in malaysia family mart still below rm10

Thanks for the recommendation! But I couldn't find such affordable decent hotels in that particular area that you have stated at that price range through agoda...

Why is it the dumbest thing to do? Why so sour?
Btw people, are these passes good? I checked the places I want to go to in Tokyo, all seems to be using Tokyo Metro lines anyways.
Klook Tokyo Unlimited Passes

EG: if i travel from my hotel to Shibuya, also cost about RM7 one-way already. This passes costs me RM45 for 3 days with unlimited usages, sounds like a deal?