I think that when you open Scrolls for the first time Mentorbot should told you something so you know it exists. Something like:
Mentorbot: Welcome to Scrolls! I'm just a robot but I'm here to help you! If you don't know what's something just tell me the name of that thing so I can help you with that. I'll always be in the Newbie room if you need help but you can simply add me to your friend list if you wish

Just click on face in the top right of the screen and add me as a friend... or I should say a robo-friend!
(Obviously the jokes can be taken off... xD)
Some Input/output I think it's worth it:
Input: Mentorbot
Output: Hi [Name of the player]! Mentorbot is here to help you out with your burning questions! This are some of the topics you can ask for: [List of topics]
Input: Trade
Output: In scrolls you can easily trade gold and scrolls. You have to click the name of a player in the list room or in your friend list and click trade, then you can add the gold and scrolls you want and the other player has to do the same! Remember that there's a Black Market that also helps to obtain or sell scrolls when you are offline, if you want more information on that just say: Black Market.
Input: Black Market
Output: Black Market can be found in the Shop where you can access by clicking 'Shop' in the top menu. In this place you can set a price and sell the scrolls you want except the ones that have a lock on them! If you want more information on locked scrolls just say: Locked scrolls.
Input: Shop
Output: You can access by clicking 'Shop' in the top menu. There's are some cool stuff there so take your time to explore all the sections! You can sell ad buy Scrolls but… some people prefer to go into the black market to get better prices and obtain the scrolls you want. The button to access into the Black Market is next to the Buy Sell buttons. Go there to your own risk! If you want more information on Black Market just say: Black Market.
Input: Locked scrolls
Output: Lock scrolls are scrolls that you've obtaining just by playing! This scrolls belong to the starter decks and you can't sell or trade them but you can craft them! If you want more information on crafting just say: Crafting.
Input: Crafting
Output: You can craft 3 scrolls into one more beautiful! That means you loose 2 scrolls and one scrolls is upgraded. If a scrolls is not upgraded is called a Tier1 scrolls, if you convine 3 of those you obtain one Tier2 scroll that is capable of carrying stats with it. If you convine 3 Tier2 Scrolls you obtain the maximum Tier scrolls you could get and that is a Tier3 scroll! That scroll not only carries the stats but also gives you extra money when you draw them in a match!
What I would like to recall is that see as I try to connect everything so a new player knows that the shop is connected to Black Market and viceversa. You can add things like: Gold, Deck Builder and things like that but I don't have time right now!