A passport money for ticktes and a plane would help.
Belfast is part of the UK. Technically you do not need any form of identification
Check with the ferry operators
no, but some form of i.d. is always useful
you require photogrpahic ID eg, passport or driving licence, your airline will be able to provide you with a full list of appropriate ID's
Yes, as long as it has your photo on the licence Airlines only need photographic ID not passports to travel internally within the UK.
It's much easier to take a train - and you won't need ID.
The photocard part of the driving licence is valid as ID when flying domestic. I've used it on a couple of routes.
Yes, every person needs a passport to fly somewhere. no, you don't always need a passport! It probably won't if you flying are to Belfast from another airport within the UK. Best to check with your airline before you travel but infants on domestic flights can often travel without ID. You might need to take their birth certificate instead.
Depends where you are travelling to. If it's within the country or the EU then no i dont think so.
You need photographic ID for ANY flight!
No