If you look at the Tarbell books or study old-school thimble magic, you'll be able to adapt a lot of the sleights with normal finger rings. In fact, Garrett Thomas' Ring Thing makes use of an old thimble magic ruse, and it's one of the most visual ring effects you can perform. Similarly, I find that Gregory Wilson's Ring Fright from his On the Spot video gets some amusing reactions from laypeople. In effect, after having a borrowed ring shift from finger to finger, you accidentally throw it across the street only to have it reproduced on your finger again.
If you're willing to put in the necessary work in arts&crafts, I've been a fan of Richard Sanders' effect, Interlace. A borrowed ring vanishes and is found looped on your shoelace. In fact, there are 100s of versions of Ring Flight that you should probably look into if ring magic's your new thing.
Someone already mentioned Tarantula. If you're not a fan of reels, I recommend you just get a set of loops and perform a suspension using a borrowed wedding band. This is another reputation maker as well. Loops are extremely versatile anyway.
Hope this gets you started.
RS.