Here is the pattern I use for the fingerless gloves.
Loosley chain 23 for Med. Hand ( Large hand is CH. 25. )
Join chain with SL ST to form loop.
Chain 1, then.. HDC for total of 10 rounds ( If you want it to longer, this is where you could add more OR make less rows to shorten it. ) " Join each round with a Slip Stitch ".
Always chain 1 at beginning each of round.
THUMB HOLE ... next 3 rows you HDC and TURN. This leaves an opening for your thumb. At end of 3rd row, join with slipstitch. Then HDC 3 more times. Break Yarn and weave in ends.
( The pattern was free on the internet...I changed it a little for what I wanted. )
I got a bit tired of Dark Brown yarn. That's what I'm using to make the Afghan I'm also working on. ( There is a picture of it in progress in a few posts back.)