You would often start by working for free for local bands. Many people get their first job through contacts.
You can also get relevant experience through things like working backstage in school, college or amateur theatre, casual work at local concert venues and gigs and working for equipment hire and supply companies.
It would be helpful to have a driving licence. You may have an advantage if you have a Large Goods Vehicle (LGV) licence or Passenger Service Vehicle (PSV) licence, which would allow you to drive tour buses and lorries.
You do not need formal qualifications to work as a roadie, but you may have an advantage with experience and qualifications in electronics, electrical work, sound production or lighting.
A good knowledge of a range of musical instruments also helps as you may be responsible for setting them up for the musicians.
The more skills you have, the more employable you will be.