here is a quick refresher on how to tie the knots required for rigging your Sunfish.
the halyard connects to the upper boom with a clove hitch:
the halyard should be led through the deck fairlead and then tied off to the deck horn cleat using a cleat hitch:
if your mainsheet does not have a snap clip on the end of it, then you can tie the end of the mainsheet to the bridle at the back end of your Sunfish with the very useful bowline knot:
after passing the mainsheet through the (2) boom blocks on the lower boom, feed the mainsheet through your mainsheet ratchet block (or similar). as a safety measure, you should then tie a stopper knot into the end of your mainsheet. I like to use a figure 8 stopper knot:
all of these knots (and more) are detailed at Animated Knots.
if you don’t have a ratchet block for your mainsheet, I would highly recommend one. I’ve been using a Harken 2135, and it is a very nice system for controlling your mainsheet.
for additional information on rigging your Sunfish, see my compilation of various Sunfish rigging guides.