which was it's first mission?
Project Mercury - On May 5, 1961, astronaut Alan Shepard became the first American in space aboard a capsule he named "Freedom 7"
NASA
By 1958, the space plane concepts were eliminated in favor of the ballistic capsule, and NASA renamed it Project Mercury. The first seven astronauts were selected among candidates from the Navy, Air Force and Marine test pilot programs. On May 5, 1961, astronaut Alan Shepard became the first American in space aboard a capsule he named "Freedom 7", launched on a Redstone booster on a 15-minute ballistic (suborbital) flight. John Glenn became the first American to be launched into orbit, on an Atlas launch vehicle on February 20, 1962, aboard "Friendship 7". Glenn completed three orbits, after which three more orbital flights were made, culminating in L. Gordon Cooper's 22-orbit flight "Faith 7", May 15–16, 1963. 
who is the second person step on moon Buzz Aldrin where was he born? Glen Ridge, New Jersey, United States when? January 20, 1930 which space agency did he work in? NASA what does it stand for? National Aeronautics and Space Administration when was it established? 1958
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NASA [SEP] Project Mercury (1958–1963)
On May 5, 1961, astronaut Alan Shepard became the first American in space aboard a capsule he named "Freedom 7", launched on a Redstone booster on a 15-minute ballistic (suborbital) flight. John Glenn became the first American to be launched into orbit, on an Atlas launch vehicle on February 20, 1962, aboard "Friendship 7". Glenn completed three orbits, after which three more orbital flights were made, culminating in L. Gordon Cooper's 22-orbit flight "Faith 7", May 15–16, 1963. Katherine Johnson, Mary Jackson, and Dorothy Vaughan were three of the human computers doing calculations on trajectories during the Space Race. Johnson was well known for doing trajectory calculations for John Glenn's mission in 1962, where she was running the same equations by hand that were being run on the computer.