What to do after I arrive in the UK?

[Terpe]

I got my spouse visa yesterday after waiting for 30 days. My CFO seminar is on Monday and I will be flying on the 15th. What do I do when I get to the UK? I have read somewhere but I couldn't find it anymore that I will be needing to wait for an ID so I could work. Is this right? Can you please guide me on what are the things I need to do and apply when I get to the UK? Thank you so much!

I've merged your previous thread under this posting with this existing thread to keep all posts together. Hope that's OK