I would start now, and every dog you see, anywhere, in person, on the net, at breeder's sites. Everyone that you like, and everyone that you dislike, start looking at pedigrees, look at who was behind that dog, and if there was line breeding, back massing, etc. Try to get a feel for who (what dogs/lines) produces what with respect to temperament, health, and looks.
Definitely do all you can with your current dog, and keep your eyes open for all the things you want to do differently, purchase differently when you go to get your foundation bitch.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.