Riging hand with Rigify help

I’ve positioned all the bones, named each one etc. but then the Generate Rig button is greyed out. Searching around I’ve found out I’m supposed to set up the “Rigify Type” from the Pose Mode but I have no clue which type goes with each bone. In addition in the tutorials I’ve seen looks like it’s automatic, no set up necessary.

Hi, rigify will only generate on rigify metarig rigs.
If you created a rig from scratch that will not work.

That’s already done when you use the Rigify Metarig, which is all the bones you should be positioning.