What's on Boris Johnson's to-do list?

The UK's next prime minister - Boris Johnson - has started his new job.

He officially took over from Theresa May on Wednesday afternoon.  

Mr Johnson has got the country's top job after winning a vote to become the new leader of the Conservative Party - the political group which currently makes up the UK government.

Jenny's been taking a look at some of the tasks at the top of his to-do list.