Howdy from North Texas.

Your form looks a lot better than mine did after only two weeks.

Excellent! thank you for the video. What a great way to introduce yourself!   This should become the new norm. Welcome from California!

Thanks everyone for the warm welcome.
I'm still slinging all over the place , sometimes releasing way too early or way too late , but when it's straight it feels great , by Google maps estimation my furthest was about 60 m

Ouch.
You are in one of the few countries on earth where finding a place to sling, no matter where you go, is a huge problem.
That'll just make your experience so much more special. Keep us updated.

Greetings from the great north.

  Welcome, El_Jefe.  It looks like you've been slinging for a year, not two weeks.

for general sling practice, you can usually get away with tennis balls in public areas.
With tennis balls, More people tend to want to learn what you're doing than tell you to stop.

So always carry a spare sling and several tennis balls so they can have a go.

The butterfly sling is a really good place to start as far as tennis ball slings goes.: https://slinging.org/forum/YaBB.pl?num=1344443925/15

If you use loop attachments like i do, then you domn't need to find leather.
Because it grips the pouch at the sides without putting any stress on the holes, you can use: canvas, denim - almost any reasonably tough material