I assume you have a spinnaker halyard running through a sheave on the front of the mast above where the forestay attaches and down though a hoop slighthly below the sheave. If your halyard attaches with a snap shackle I recommend you have a large plastic bobble above it as I found the shackle will pass through the hoop and undo itself on the way with embarrassing consequences.
I just use a simple rope loop about 8 inches long to attach the tack to the front of the pole. Nice and simple. Others like to adjust the the tack line but I have yet to try it.
If you don't already have sheets the best thing to do is buy a couple of Laser main sheets off eBay. They are the right length and diameter. You can just tie them onto the clew with bowlines or invest in a couple of snap shackles which make rigging much easier.
The sheets must go outside everything (every stanchion and every shroud and of course the forestay) but inside the halyard. Its easy to visualise this when the spinnaker is hoisted but not so easy when it's on deck in its bag (i.e. when you have to tie all the ropes on !). If you get it wrong you won't be able to gybe.
The sheets lead back to a couple of ratchet blocks at the back of the boat and then forwards onto a winch. On Juicy Blue the blocks are attached to loops welded onto the forward most part of the pushpit. My previous boat had eyes bolted through the deck just forward of the pushpit.
I snuff and un-snuff from the mast. Nice and simple and you can see what you are doing. But you are not in the cockpit. There are cleats on the mast to which you can tie off the snuffer line.
Hope that helps. Let me know if you want to skype or something.
Mike Ball
P235 No 36 "Juicy Blue"