For the license application process part, you pay RM 150 for IDP (International Driving Permit) that is valid for 1 year. You need to renew it each year but if you don't need it beyond the current vacation, you can just let it lapse.

As for document requirements, you need the following documents.
1. Valid Malaysian driver's license that has more than 1 year till expiry (i.e. Malaysian driver's license cannot expire before IDP, hence the expiry requirement)
2. Photocopy of your IC (back and front) and driver's license (back and front)
3. Passport size colour photo (the photo will be pasted onto your IDP)

JPJ counters are only open from Monday till Friday, so recommended to go to UTC centre as they are open on weekends. I had just went to UTC Shah Alam last month to apply for permit. As my driving license expires in July, I did the license renewal first, followed by the IDP, both at UTC on the same morning. Told the officer that I wanted to do both renewal and IDP application, so he did the renewal first and then was told to meet back up with him again at the same counter once I get my new license (a photocopy of the new license is needed too, but photocopy services are available on that floor). Did not need to take another ticket for the IDP part as he attended to me after he settled his immediate customer. Not sure if other officers have different ways to handle such requests.

Source: https://www.jpj.gov.my/en/web/main-site/pem...-driving-permit

License renewal (if gonna expire soon) don't have to do together with IDP at UTC/JPJ. Just go with whichever is most convenient (e.g. renew at Pos Malaysia at an earlier date).