Greetings, Arnellathon
and welcome to the forum!
Tint is an experienced slinger and has given you sound advice, which I will second. I am 5' 11 1/2" and I use a sling that is only 14 inches folded. Check out the historical gallery for the ancient Egyptian sling which, if I recall correctly, is only a foot long.
Also, my first sling did not work well, so don't be discouraged if your first sling needs some "adjustment." My second sling has proven to be excellent. I have made a couple more slings for friends and the longest was 17 inches. Check out the members gallery for all kinds of ingenious slings to get some ideas.
Tell us, how did you become interested in the sling? Let me recommend to you the movie "Clan of the Cave Bear" as this has some very interesting depictions of slinging in it. In the story, apparently weapons are forbidden to women by the tribe, but Ayla ( the central character ) develops power and independence by learning to sling. ( I have a female friend who is a real Ayla enthusiast and who loved all of the books in the series on which the movie is based. )
Last but not least, let me point out that one of the fun things about Slinging.org is that slingers are from all over. You are in Arizona, I am in Massachusetts, and Tint is in Hong Kong ( on the other side of the planet! ) Although I understand how this technology works, even so, it is amazing! I look forward to reading your posts!!
.......Dan