uncreative

i have an unknown vintage ( i think 96-97) Bianchi veloce that its time to upgrade or replace. it currently has a full campy veloce group.

the desired outcome is to lower the gearing and replace the worn cassette, chain and chainrings. given how obsolete the components are, it appears that i will need to replace almost everything.

can anyone point me to any resources that can help me determine what my upgrade options are?

Thanks!