As Paul says I may be able to give you a few pointers as I fitted a tri radial spinnaker to my 36 nearly 4 years ago.
I could at this stage go to great lenghts to tell you how to rig a full down wind spinnaker but that would be of no use if you are thinking of fitting a genniker.
Have you decided yet if you want a full downwind spinnaker or genniker, if not what type of sailing do you do and how many crew do you normally sail with. If you are normally short handed (2 crew) then a spinnaker can be a bit of a handful.
Also how much experience have you had with spinnakers? If it’s very little then I’d go for the genniker.
If you could provide a bit more info on what you are thinking of fitting I’ll happily pass on any info I can.