Teleport to friend in game script. Not sure where to start?

Hi, I'm trying to make a button that follow friends in game. I don't even know where to start, I kinda just need someone to point me in the right direction and I'll do my best to go on from there. Right now I have a scrolling frame and a button but that's it. Not sure how to even go at this, any help is appreciated.

Thank you!

My attempt:

OnlineFriends = {}

function Friends()
return player:GetFriendsOnline() -- thats as far as I know how to go
end

Note: Not trying to get anyone to do this for me, just want to know where to start, how to go at this. Please don't delete this question.