How do I make my baby take a dummy?

My baby is 2 months old and has never accepted a dummy. But she’s now starting to suck her fingers a lot when tired or sleeping, but can’t quite do it, plus her fingers are so tiny I don’t think they would give her the comfort she’s after. She does like to suck on my pinkie though, it calms her down or even sends her to sleep. A dummy would be much easier... any advice on how to transition her from my finger to a dummy???