Hello there, i'm Grif and i'm from Portugal.
I've been interested in archery, slings and generally speaking ancient warfare for as long as I can remember and even though I did get a couple of bows I never really got into slinging, partly I think because i'm not really handy with tools/knots/whatnot but I always had the itch to try it.

As a joke I made a crappy sling with hard fabric pouch and double stranded boot lacing and surprisingly it felt really good throwing stone across the fields so I decided to look for more information about slinging and... here I am.

I got 60m of sisal twine for 1€ (criminally cheap) and equipped with the rockman tutorial I plan on doing my first real sling tomorrow.

Cheers 

Hello and welcome to the site.  I normally tell beginning slingers to use tennis balls when first starting out.  They are much safer until you can get the projectile to go in the direction you want.