One of the great general conference talks that’s been given on member missionary work was given in October 2001 by Elder Dallin H Oaks. That talk, Sharing the Gospel, was a foundational talk for me as I served at that time as the bishop of a ward in the Washington DC Stake. Member missionary work was an important theme of my service as bishop and I leaned on this talk a great deal in helping members of the ward have success as member missionaries.
I encourage you to re-read that talk. More importantly, follow what he says and practice the principles that he teaches. If you do, you will be a very successful member missionary!