Hello Chaps,
Well you did ask !!
I look for the most cost effective way to do most things 
Here are a few products for you to consider, I would not use any sort of basic cordage for the standing rigging to hold the mast up as it stretch's, unless you want to buy Dyneema £££ , my favourite way of holding up the mast is Stainless Steel fishing trace which comes plastic coated with tube crimps, the fishing shop is your best friend for hooks and swivels etc.
Crochet yarn, whipping twine (from a yacht chandler's) , and lines from cheap kites all have their uses, here are a selection below.
I used to use brass bottle screws for tensioning the stays, but I really don't think they are neccessary unless it's a racing boat, but are £5.00 each approx. Bowsies are of limited use in my view, but can be used for adjusting the length of the sheets
Hope that helps
Regards Ray
Edited By Ray Wood 2 on 01/04/2022 13:35:08