Joseph Smith found the plates that he translated into the Book of Mormon, along with the Urim and Thummim (mentioned in the Old Testament and a means of translating the plates) buried in a hill near his home in upstate New York. Members of the Church of Jesus Christ of Latter Day Saints (commonly called "Mormons") believe that he was lead to the place by an angel.
You can read the Book of Mormon, which he translated from the plates, or learn more about this story from the links provided below.
Joseph Smith did not find Missouri. It was already a well known and established place with many cities and towns before he arrived.
Err.. Yes.
Joseph Smith organized the Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" church) in 1830.
None. Sadly, I find this offensive.
Joseph Smith was lead to the hill near his home by the angel Moroni, who showed him where the plates were buried. The hill did not have a name at the time. Mormons call the hill Cumorah, because the Book of Mormon says that the plates were buried by Moroni in the hill Cumorah. Non-Mormons often call the hill "Mormon Hill" or "Gold Bible Hill".
I can't find a Joseph Smith Memorial Building in Idaho, but there is one in Salt Lake City, Utah at 15 East South Temple Street.
Joseph Smith Jr.'s grave site is owned by the Community of Christ (formerly the Reorganized Church of Jesus Christ of Latter Day Saints) and is located in Nauvoo, Illinois in the Smith Family Cemetery next to the Homestead House. (this is not the original site, however) He is buried with his wife, Emma Hale Smith, and his brother, Hyrum Smith. It is now thought that the body of Hyrum is under Joseph's name and Joseph's body is under Hyrum's name - but that is just speculation.
Brigham Young actually didn't make many changes to the Church. Everything that Brigham Young did was in response to previous instruction given by Joseph Smith. For example, Brigham Young moved the Church to Utah because Joseph Smith prophesied in 1842 that the saints would find peace in the Rocky Mountains. Brigham Young expanded the practice of polygamy, but Joseph Smith had preached in favor of the practice as early as 1831 (polygamy officially began in 1843, still with Joseph Smith's approval). Brigham Young also expanded the practice of consecration (the 'United Order'), which Joseph Smith taught in 1834. (The practice is also found in the Bible and the Book of Mormon.) Brigham Young also expanded temple building (begun by Joseph Smith) and performed temple ordinances, which were given to him by Joseph in 1842.
Joseph Smith helped the Mormons by creating them! Mormons (members of the Church of Jesus Christ of Latter-day Saints) believe that Jesus Christ restored the true New Testament Christian Church through Joseph Smith. Without Joseph Smith, there would have never been a such thing as Mormons. You can learn more about Joseph Smith and how he founded the church at the "Related Links" below.
Depends where you live.
I believe Lake Success is a town on the border between Nassau County, Long Island and Queens, NY. I don't think there is a Lake Success in upstate, NY.
where can you find a picture of Joseph Gayetty?