You can start here. That will explain the basics to help you along and lists some family friendly servers. This is a more exhaustive server site, but caution should always be exercised. I personally play with my son and wife via LAN for the most secured experience.
If you are looking for a family and child friendly server. Either go to Hypixel. I think there is a way to disable chat on the server. I will update this post when I verify later today. (On a Chromebook atm)
If you want to play with someone together. Maybe ask some other children from your neighbourhood or school and ask them to come over with a laptop or install the game on another computer you may have in the house.