Newcomers might want to stop with Impressionists.
Newcomers may prefer to start at the top with the Impressionists and Post- Renoir, Cezanne, Manet, Monet, Toulouse-Lautrec, Degas, and Van Gogh (this is the best collection of his work outside Amsterdam, with several works from the frenzied months of activity before he died in 1890).