Easiest option is to set up an RF (one of the few things that are free from the CAA) however you will still need to splash out on the premises and associated books and manuals that will be required. RF though will not alow converstions for later. As previously stated you will also need to obtain an FI of standing that the CAA will accept. I doubt very much that one with enough experience will be willing to work for flying pay on a start up operation but will wish to be salaried. Along with all the other usual costs involved.
If you wish to have a chat then by all means PM me for contact details.
Max T.