Thanks for your recommendation of the places to visit. I like all those place but changing accomodation 5 times a bit headache like what cc980024 bro's mentioned below. Can help to reschedule to the most 3 places to stay? Based on your itinerary is Noberibetsu 2 nights, sapporo 1 nights, asahikawa 2 nights, sapporo 1 night, chitose 1 nigths, maybe help me to schedule to 2 nights each place. Thanks ya.
Thanks for your sharing. Changing accomodation too frequent is a big issue to me. After reading your experienced on the packed train and the super crazy expensive taxi fare posted by icehart i decided to rent car instead of taking train. Maybe mixture of self driving and taking train.

Bro, what do you think about snowfall during my plan duration from 14/12 to 22/12? Will i encounter heavy snowfall?

Have not done any study for the past 2 weeks due to CNY.

I rescheduled the plan hokkaido winter tour to this duration due to cheaper flight fare. The duration is from 15/12 to 23/12.

15/12 (JAL-economy) - 12 hours
22:50 - 06:35 KLIA-Tokyo, 10:30 - 12:00 Tokyo-Sapporo. RM 975 each

23/12 (JAL-premium economy)-24 hours
19:00-20:40 Sapporo-Tokyo 11:05:18:10 Tokyo-KLIa. RM 1495

Before firm up my itinerary, i have few doubt here and need guidances :
1. Visa. I googled and found out Malaysian do not required Visa when visiting Japan. Is  there any others document i need to prepare?

2. Do i need to purchase any insurance?

3. I will need to apply international driving permit, right? Is it alright if i apply one month in advance before the trip?

4. Transit hours. For KLIA flight to Sapporo and transit at Tokyo is alright cause it is just about 4 hours. I can just spend my time around airport area. How about the flight back from Sapporo to KLIA and transit at Tokyo? There is total 14 hours and over night. Should i find the nearest hotel to stay. Is it expensive? Or how i should go about.

There is return flight which takes 11 hour from Sapporo to KLIA and transit at Tokyo (2 hours) but the departure time is at 7:50am. This is probably too early cause normally we need to check in 3 hours before the flight which meant we need to get ready check out hotel at about 2-3am. If i wish to take this 7:50am flight, what should i do for the last night before leaving Sapporo?

First time DIY tour and a lot of questions to ask.

I have not done much study yet about the JR Rail pass or Hokkaido Rail Pass and not sure where to buy, how to buy and how to top up. Before coming to that i wish to estimate the train fare i will need to spend. I could not find much information on google. I read there are no round trip fare from sapporo to asahikawa and 1 way ticket is 5000++ and is different by time. I attached herewith my planned train schedule. May i know approximate how much i have to spend on train fare? And also please recommend some good hotel to stay at Noboribetsu (2 nights), Sapporo (4 nights) and New chitose (1 night). Budget about RM300 to RM500 per night. Thanks

If you have an IC, you dont need to queue as long as you have enough money in the card. THere are a few rail pass and you need to know where you are going to get the most economical pass.

Very busy for the past few weeks and only done some study on train pass. It is not worth to buy Hokkaido rail pass for my trip. I had done the calculation as follows ;
CTS to Noboribetsu (1 way 3000 yen), noboribetsu to Toya (1 way 2700 yen), Toya to Sapporo (1 way 5920 yen), sapporo to Asahikawa (round trip 5080 yen). Total about 16,700. (Express train fare). Hokkaido 7 days train pass is 24,000 yen. So decided to use smart card IC but i am not sure which card  cover the the train to the places i intend to go (chitose, noboribetsu, toya, sapporo & asahikawa). What i know is Sapica cover only sapporo for subway, buses and streetcars) and kitaca can use for Sapica area and also outside of Sapporo. Can anyone introduce which smart card IC to use ? Which cover the train to the places as mentioned above, subway and buses in Sapporo. Can the card also use for buses within noboribetsu, toya and asahikawa ?

Basically the date of visit to hokkaido is fix. Internet access will use Klook 4G wifi. I go for ANA instead of JAL cause cheaper. Accomodation not decided yet not sure to go for all hotel or mixture with airbnb. Still a long way to go before firm up my itinerary. Hope to hear some comments from sifu here.