Haberman had a bunch of used/new SC19 sails listed on his site, I'de start there for sails. As for maintenance, as long as the standing and running rigging is in good shape and your blocks roll smoothly you should be good to go. Check the hulls for any softness in front of the cross bar on both the inside and outside and the bottom for wear....have fun!
JeffW SC17
GYC/TBCSI