Some forms and documents can be downloaded here.
Not all state offices use the same forms so check you use the correct ones.
These are provided for reference purposes only; it is advisable to obtain the official forms directly from the relevant office.
Immigration (also see the JIM website)
JPN (also see the JPN website)
JPJ (also see the JPJ website)
British High Commission (also see the UK government website)
'Foreign Spouses of Malaysian Citizens' Facebook Group
This is a good source for application forms and other documents:
You will need to join the Group to access the information