His dream was that he and Lennie would make some money on the ranch and will then go away and buy a small plot of land, with a house, and farm it. I haven't seen Mice and Men in a long time so i think this was his dream.
The Idea of a Dream in Of Mice and Men by John Steinbeck
George has a dream that he and Lennie shall make some money on the ranch and will then go away and buy a small plot of land, with a house, and farm it.