new xbox 360 all set up-can't seem to get two player set up

I'm am new to Xbox One. We got one for the family this Xmas. I don't understand profiles. Where do I go to get it all explained? Things like

- if my kids want to play a game, do they have to be signed into their own profile to build on points etc?

- my kids are 10 & 12. Do they need their own account (i.e. their own email etc)

- I don't particularly want them to know any passwords I set up so how do they change profiles

- do you actually need to log in overtime you turn the xbox on or does it automatically log in

- if you have xbox live, can my two kids play the one game together (is that how the multiplayer works)

Sorry for the questions. Never used an Xbox before. Thanks for any help you can give

I see that you have a Gold membership and unless you are not connected to an ethernet cable or wireless you should be connected to the Live service.

However, currently there is an issue with Live on the Xbox consoles right now that could be preventing you from playing online. Please keep an eye on the link below for more information as to when the service will be back up again.

support.xbox.com/.../xbox-live-status

Greetings! Welcome to Xbox.

For some games, you need to be signed into an Xbox LIVE account to play, especially if it is an online game.

Xbox LIVE is free if you want a silver account. Xbox LIVE Gold can be purchased, and allows you to play with others, join parties, and more.

Any more questions, just ask!

Welcome again!

Each of your kids would need to have their own profile (linked to separate email addresses) if they want to earn their own achievements, etc. They do not need to know their passwords, you can set the console up to remember the passwords when they sign in
if you like.

You can set the console to only log in one profile at a time. Any other profile would need to be logged in as each person plays.

On the Xbox One, you can share one Gold membership among all the family. Head to Settings and scroll right until you see Add to Family. You can add each family member there to set up sharing. If the game supports split screen multiplayer then both kids
can play at the same time. Examples of games that support split screen are Minecraft and Disney Infinity 2.0.

Have you updated to the latest dashboard? The transfer software is built into the latest version.