You should be aware that some new laws have been introduced into cricket for the 2018 season together with some changes in how player behaviour is handled.
Whilst the subject matter is a bit dry all senior and junior players should spend some time reviewing the material included in the link below as umpires will assume you know the new laws.
https://ecb-comms.co.uk/2SWP-O1J4-5531JVS577/cr.aspx