Year 1:

Trial and Triumph (Church History) by Richard Hannula
Handbook of Nature Study by Anna Botsford Comstock (to be used for 6 years)
a Math program
Paddle to the Sea by Holling C Holling (your library might have it)
D'Aulaire books if your library does not have them (Ben Franklin, George Washington, Buffalo Bill)
children's picture books by James Herriot if your library doesn't have them
Aesop's Fables illustrated by Milo Winter, paperback, is nice to have
a phonics program
a well-illustrated (not by Thomas Kinkade - see note below) version of A Child's Garden of Verses is good to own
When we were Very Young and Now we are Six by Milne (although most libraries will have these)
Laura Ingalls Wilder books if your library does not have them
Other books can be read online or borrowed from the library.