Hi, Ayani.
Well, in a nutshell, it all begins when one hears and is converted to the gospel of Jesus Christ and has faith that Jesus Christ can and wishes to pay the price for his sins. The next step in for him to repent of those sins, be baptised by immersion for the remission of those sins by one holding the proper authority to do so, and receive the Gift of the Holy Ghost by the laying on of hands.
We believe that when we enter into a covenant relationship with our Savior at the time we are baptized, He promises us that if we will remain faithful to Him throughout our lives, doing our best to keep His commandments and repenting whenever we fall short, He will become our advocate with our Father in Heaven. His Atonement paid the price for our sins and absolves us of the guilt associated with those sins. Because we have been cleansed by His sacrifice, we can look forward to being reconciled with our Father in Heaven and living with Him eternally.