Hi,
Attached are two diagrams.
As Tigertiger states please post a photo and we can help from there.
The first photo is a gooseneck, the bit that holds the boom to the mast.
The fitting below the boom is the kicking strap, although this is a metal version it can be done with rigging cord.
As with full size yachts it depends how much money you are prepared to invest.
Regards