Developing a Football Manager with Java; What to consider for: Design pattern, JavaFX skinning (/w ps), MP functionality, Android version, etc

I am developing a Football Manager Game with a group of friends, what should we consider for:

• Design pattern: We don't really know which one we should use. One that took my attention during previous lectures is MVC, but isn't that kinda overkill in this situation? And what other design patterns are great for our situation, and why?

• GUI: We decided to work with JavaFX, but no one really has experience with it yet. How should we use JavaFX to work together with Photoshop (for skinning the GUI). Are there handy tools and/or plugins for this?

• Game saves: We plan on using Json files for game saves and want to use gson to make this easier. What should we keep in mind while doing this?

• Multiplayer: Is there an easy way to implement online multiplayer functionality to the game?

Least priority:

-Android version. What should we keep in mind if we want to potentially create an Android version of the game, and are there easy ways to do this?

Any kind of help is really appreciated!