In all honesty, merely getting a hold of someone else's EFB Policy & Procedures Manual wont really assist that much, as you need to adapt the content to reflect the company you work for.
If you are using AMC 20-25 as the chosen method of compliance (link as per previous post), then you can also refer to Appendix 'G' which will give a very comprehensive outline of suggested area(s) for inclusion.
When writing the EFB Manual Suite at my employer (and EFB P&P Manual), the content within the AMC is (IMHO) exceptionally good at detailing what is required for a submission and approval to be issued.
Also, refer to your F.O.I. as ultimately your submission is going through them and also to be reviewed by their Policy and Regulation experts - and a good idea of what the local CAA require will also be evident then, plus they may even also have a handy matrix (or similar) for methods and areas to cover for compliance.
F/o