To start a new school you can only operate from a licensed aerodrome, i's a comlpex and expensive process and the planning approvals required are not straight forward either.
Therefore unless you are a wealthy avaition buff with money to throw at it the simplest option would be to join another flying club.
To pursue flying beyong gaining your licence you could join a group owned aircraft scheme which doesn't have to operate from a licensed aerodrome so there are some benefits there.