The registration process is fairly straight forward however they will want to know where you are going to operate from i.e. licensed aerodrome. Who your instructors are and what aeroplanes you intend to use.
There is no requirement to have any specific documentation other than the things you need for flying, NOTAMS met etc which are all available on the web; and of course the aircraft docs.
Any flying club/school would be well advised to operate as a limited company to reduce liabilities on individuals. Aircraft are required to be insured by law but it would be well worth making sure the club is well insured and that it covers instructors as well.
I don't think you will find any FOBs on line but if you want one PM me.