Minecraft Coins and joining other players worlds

It should be easy to join other players worlds and to join other players worlds you press a button that says the players name and if they are on a world you have access to the button and if you get 1st 2nd or 3rd place or your team wins on a server you get Minecraft coins. And please have it that another player when presses pause to the side of where resume game is there is a button that says INVITE TO GAME which when pressed will automatically send a in chat on that players screen will say to go in chat. -Two Boys under 10 using their mom’s account (with permission)