This is just an overview of what the fullness of the gospel means to  I think firstly i would say that  Without the 6 principles you cannot have the fullness of the gospel to begin with.  I would outline them as follows

Faith- You must have faith to begin to receive the fullness

(Hebrews 11:1 “Now faith is the assurance of things hoped for, the evidence of things not seen.”)

You could also talk about the parable of the mustard seed in Matthew 13 (starting from verse 12) encompasses a lot to do with faith.

Repentance-to be able to build on your faith and grow. You need to ask for forgiveness

(Book of Alma verse 84 “And thus we see, that there was a time granted unto man, to repent, yea, a probationary time, a time to repent and serve God.”)

Baptism-to enter into the kingdom you must be baptised

(Matthew 5:4 “Yea, blessed are they who shall believe on your words, and come down into the depth of humility, and be baptised in my name; for they shall be visited with fire and the Holy Ghost and shall receive a remission of their sins.”)

Laying on of hands– to receive the Holy Spirit

(Doctrine and Covenants 55:1B “You are called and chosen, and after you have been baptised by water, which if you do with an eye single to my glory, you shall have a remission of your sins, and a reception of the Holy Spirit by the laying on of hands.”)

 Resurrection of the dead– Just as our Lord and Savior Jesus Christ was resurrected so shall we be in the final days. (We do strive to be in the first resurrection of the just)!

(Acts 24:15 “And have hope toward God, which they themselves also allow, that there shall be a resurrection of the dead, both of the just and unjust.”)

Eternal Judgement– We will stand before the judgement seat of our Father, where you will have an account of your life.

(Revelations Chapter 20)

(Revelations 14:7 Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgement is come; and worship him that made heaven, and earth, and the sea, and the fountains of waters.”)

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So In Conclusion i would just add

..we must believe that Jesus Christ is the true Messiah. We do not worship idols, we do not worship other Gods.

..Our scriptures (inspired version, book of Mormon, Doctrine and Covenants) are the fullness of His word. What has been left out of other scriptures have been put back into our scriptures.

..Knowing that God loves us all, and remembering that we should have love for him by following his commandments, praying for forgiveness and showing love to oneself and others.