You'll need indefinite leave to remain and work in the UK.
You'll also need a far better grasp of English, I don't intend to be rude but there are pretty strict English requirements.
If you are serious then ring an FTO. If you meet the standards you will be given some options. In regards to getting sponsorship unless you own property or something worth the 60-100k required to pay for the training then you're out of luck i'm afraid.
Your only option would be an African Airline.