I grew up with my slingshot and became very proficient with it.  I probably got into more mischief with it as a kid than anything else.  I have been interested in trying a sling, not for mischief, for a while now.  I tried to buy one online but I have not found a site yet other than the biblical replica sites.  I want to make my own eventually but I wanted to have a model to work from first.  I am in Kingsville, TX if any guys are down here that hold sling making classes.  LOL.  I look forward to spending time on this site and seeing what all there is to learn about slinging.

I want to make a simple one but it would be nice to buy an elaborate one for show.

Hello, welcome.
I am new here too. The big surprise is how fast and easy many of the slings are to make so you can try many different ways with little time or cost.
A quick answer to your questions:
Length varies but mine, when finished, hang from the hand to the top of the ankle.
Most are finger loops.
Most tie knots.
Its so easy to add your own taste and style.
Good luck