From date of first exam you have 18 months to complete all 14 subjects, in a maximum of 6 sittings.
As MJ says its all available via google but to start you off:
From completion of your exams you then have 36months to complete CPL/MEIR and (I think) Mcc to obtain frozen atpl.
I'm using cats online as its the cheapest and offers flexibility - you can do the exams in 3 stages rather than 2 most FFTOs require which allows me to fit it around work. The notes aren't brilliant so if you go with them I would suggest getting hold of some Bristol notes.
You will (if you have any sense) make use of the various question
banks available which you can subscribe to. Most of these are available on iPad.
No restrictions to my knowledge on which ground school you attend (so long as it is CAA accredited) and no requirement to do your flying at the same place.