A multi player game question

I’m new to multiplayer and networking (I’ve worked previously on offline games) I followed a tutorial and made a steam based host and join multiplayer game but the problem is I don’t want to do that I want my users to click on find game button and want them automatically join a game (Limited to first 60 users if exceeded join other game). How to do this through blueprints (If not possible in bp then tell me how to achieve this in C++) ?

How to save progress (Can it be done through steam?) to your account?

To be bit more specific Look at these Images: I created this:- [Watch from 31:16] I want something like this:-

234832-ros-1.jpg

As in the image above I want a server selection button and as I select the server there

234833-ros-2.jpg

I must get my menu where if I press start I want it to automatically search for a game and with a limit of 60 members game must start. Something like in this video How to Play Rules of Survival OFFICIAL PC Version (Works 100%!) - YouTube [Watch from 4:50 min]

Please help me out Thank you in advance.