Some forms and documents can be downloaded from these sources.
Not all state offices use the same forms so check you use the correct ones.
It is advisable to obtain the official forms directly from the relevant office.
Immigration: see the JIM website
JPN: see the JPN website
JPJ: also see the JPJ website
British High Commission: 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