Guillermo:
Figure 13 of the plans shows the rigging details. You will need:
1 halyard single pulley block (at the top of the mast)
2 single pully blocks for the mainsheet - one in the forward part of the boom and one on the "traveller" (rope tied to the stern)
1 double pully block for the end of the boom.
When rigging my mainsheet, I run it first through the forward block on the boom, back through the one side of the double block at the end of the boom, down through the block on the traveller, back up again and through the other side of the double block. I then tie a figure 8 knot in it to keep it from coming back out. Theoretically you could get by with a single block there as well, but you would need a place to tie the end of the mainsheet to the end of the boom.
Make sure you have enough line in your mainsheet so that when your sail is blown forward you still have line in the cockpit. I tend to tie a figure 8 knot in the mainsheet at the point where it will stop the sail from going completely forward and then another one at the end that I keep in the cockpit.
Hopefully this makes sense. If you take a look at http://www.floatingbear.ca/sailingfiles/minicup/20040619_Mini_Cup.jpg you might be able to see the lines in action there.