Hello,
Times have changed. Ive never heard anyone call a forestay a shroud. Usually shroud is the name for a wire that holds the mast up from the side. The shroud attachment point on the hull (chain plate or shroud anchor pin) is located aft of the mast so that the shrouds also hold the mast up from the back. This way a back stay is not needed for normal sailing. I have heard the 3 wires called stays, but nautical types aren't big on the term side stay.
If you have a normal old g5.0 the jib won't furl and the forestay will be the same diameter as the shrouds only shorter. i can't remember how the jib halyard is rigged, but if the zipper sleeve is wide enough you may be able to zip the halyard inside the jib luff like a TheMightyHobie18. The placement of the turning block at the top will be a factor in the jib halyard rigging to. If it's mounted to the mast you will be cleating off the halyard at the base of the mast, and the halyard will be external. a dim memory tells me this will be the case.
The boat should have a boom and a protrusion at the mast base casting. the protrusion being the mast rotator arm. a line connects it to the boom limiting the amount of mast rotation. More rotation for strong wind-less for light wind.
i'm guessing the screwdriver mentioned is the mast pin or hinge for raisng the mast, and the plastic cap is the bearing upon which the mast sits.