I've been offered a job... what on earth happens now?

I'm sure that they will take you on a little tour so you know where everything is. They will then probably pair you up with someone that's got some experience untill you've got hang of what you're doing.

First day of my first job: loads of training.
First day of my second job: right in at the deep end.

Really depends on the job, where are you working?

Make sure you ask questions if you are unsure - better to take the time to ask than make a big screw up and have to do it all again.

Polish up on your IT skills if you can.

Show an interest and be enthusiastic.

Oh and get to know your colleagues - don't alienate yourself.

Hahah. Thanks everyone, all excellent advice really-- I'm just shamefully overexcited. It's a really small office and a very intensive working life so I'm thinking it'll probably be 'right in at the deep end'.

I'm working in politics.

Actually that makes it sound like I'm working for MI6. I'm really not, it's not even in governance or party political, but it's in Westminster village.