…is there any documentation i could read about plans being made to move west?
In early 1844 Joseph Smith aggressively organized efforts to prepare for western exploration of Oregon, Texas, California and the Great Basin for a site for a new city.
History of the Church 6:224. February 23, 1844:
Met with the Twelve in the assembly room concerning the Oregon and California Exploring Expedition; Hyrum and Sidney present. I told them I wanted an exploration of all that mountain country.
Thomas B. H. Stenhouse, once a faithful Mormon, later wrote an expose called the Rocky Mountain Saints. On page 146 he wrote, “As early as 1842, he [Smith] prophesied that the Saints would remove to the Rocky Mountains, and in the spring of 1844, while troubles were increasing upon him, he selected a company of men to explore that unknown region, prophesying at the same time that within five years from that date, the Saints should be located there beyond the influence of mobs.”
Stenhouse accepts one of Smith’s diary entries as proof in this case. Yet the entry cited does not mention the Rocky Mountains by name. Instead, it records that Smith sent out men to scout throughout “the localities, California and Oregon” to find a suitable settling place.
Joseph Smith June 8, 1844 (Nauvoo City Council Minutes, Church Archives. See History of the Church 6:438).
& said] If God ever spoke by any man it will not be 5 years before this city in ashes and we in our Grave unless we go to Oregon [california] or some [other] place.
Texas was also considered as a place where the LDS could settle. "Due to increased persecution around Nauvoo, Joseph Smith realized that he would have to relocate the Church outside the borders of the United States. The Republic of Texas was considered by Smith a place where the Church members would be able to peacefully practice their religion. The prophet began to negotiate with Sam Houston, president of the Texas Republic, for the southern and western portions of Texas for the future Latter-day Saint nation. Joseph Smith sent Lucien Woodworth to Austin, Texas to meet with Houston. [citation needed]
Woodworth returned to Nauvoo and reported the progress he had made in May. Reports indicated plans for purchasing large tracks of land. A commission composed of Woodworth, George Miller and Almon W. Babbitt was organized to lead the final negotiations. Joseph Smith asked that Lyman Wight and Miller to prepare to lead a group of settlers to Texas with assumption that negotiations would be successful.[citation needed] These negotiations ended in the death of Joseph Smith in June 1844." (Wikipedia)