Using google alone gives quite a lot of info on that subject. The first thing you have to ask yourself and your local CAA is however what kind of EFB do you want, which savings can it produce, what kind of certification will you need.
An EFB class 1 is basicly a notebook/tablet-PC centered solution and totally portable, however it may have restrictions in what flight regimes it can be used. Class 2 requires at least part if not completely aircraft fixed installation, a certified output device (screen) and hardware interface to the aircraft. It can be done in a docking-station concept for existing notebook hardware issued to each pilot or with a fixed computing unit for each aircraft. Class 3 devices are completely integrated into the aircraft and fixed to it, and therefore need complete certification, those units are most prevalent in newer aircraft designs as buildin part of cockpit environment, for example A380/A350 or B777/787. However there are some companies that offer refit STCed refit kits.
A quick google found me an
industry overview from the FAA, however that is allready several years old and the field is developing very very fast.