Good luck with re learning to play - its a bit like riding a bike - you dont forget. I suggest you start with the Pete Seeger book and progress from there as the other contributors to this thread recomend. Best of all - keep at it as in the end you can develop your own style. I originally learned from Pete Seeger but after almost 50 years of playing have adapted to a thumb & one finger style which suits playing melody very well (Arthritis does have a few benefits)
Keep picking
Pete