I hope you have joint bank accounts, if not that needs to be changed urgently, any accounts in your husbands name will be frozen.
If your husband has made a will there should be an executor for his estate, it might be a family member, a friend, a solicitor or a bank. They will all help you with any formalities, the professionals will charge fees, others can claim expenses. If there is no will it can cause serious problems, see a solicitor it may still be possible.
Pensions will depend on the terms of the agreement.
Gathering all the information now will help put your mind at rest.
Will Replacing School Uniforms With Tracksuits......



When my DH passed away eight years ago I received a lump sum in a chequet from a past employer. It was very welcome I can tell you, but given the choice I'd rather have my DH back safe and well without that wretched illness. I also get a small pension (50% of his works pension - he'd paid in AVCs)) straight into the bank at the end of each month.
. However on digging through papers I found three occupational pensions which he hadn't claimed because the amounts involved weren't worth it. But as a surviving spouse they paid out as lump sums; not a huge amount but enough for me to buy a (very) modest house in a (very) cheap city in the UK. I've gone back to work and will probably have to keep going until I drop dead but at least I'm supporting myself. So things could be a lot worse!